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An emperor (from la, imperator, via fro, empereor) is a monarch, and usually the sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife ( empress consort), mother (empress dowager), or a woman who rules in her own right and name (empress regnant). Emperors are generally recognized to be of the highest monarchic honor and rank, surpassing kings. In Europe, the title of Emperor has been used since the Middle Ages, considered in those times equal or almost equal in dignity to that of Pope due to the latter's position as visible head of the Church and spiritual leader of the Catholic part of Western Europe. The Emperor of Japan is the only currently reigning monarch whose title is translated into English as "Emperor".

Both emperors and kings are monarchs or sovereigns, but both emperor and empress are considered the higher monarchical titles. In as much as there is a strict definition of emperor, it is that an emperor has no relations implying the superiority of any other ruler and typically rules over more than one nation. Therefore, a king might be obliged to pay tribute to another ruler, or be restrained in his actions in some unequal fashion, but an emperor should in theory be completely free of such restraints. However, monarchs heading empires have not always used the title in all contexts—the British sovereign did not assume the title Empress of the British Empire even during the incorporation of India, though she was declared Empress of India.

In Western Europe, the title of Emperor was used exclusively by the Holy Roman Emperor, whose imperial authority was derived from the concept of , i.e. they claimed succession to the authority of the Western Roman Emperors, thus linking themselves to Roman institutions and traditions as part of state ideology. Although initially ruling much of Central Europe and northern Italy, by the 19th century the Emperor exercised little power beyond the German-speaking states.

Although technically an elective title, by the late 16th century the imperial title had in practice come to be inherited by the Habsburg Archdukes of Austria and following the Thirty Years' War their control over the states (outside the Habsburg monarchy, i.e. Austria, Bohemia and various territories outside the empire) had become nearly non-existent. However, Napoleon Bonaparte was crowned Emperor of the French in 1804 and was shortly followed by Francis II, Holy Roman Emperor, who declared himself Emperor of Austria in the same year. The position of Holy Roman Emperor nonetheless continued until Francis II abdicated that position in 1806. In Eastern Europe, the monarchs of Russia also used to wield imperial authority as successors to the Eastern Roman Empire. Their status was officially recognized by the Holy Roman Emperor in 1514, although not officially used by the Russian monarchs until 1547. However, the Russian emperors are better known by their Russian-language title of Tsar even after Peter the Great adopted the title of Emperor of All Russia in 1721.

Historians have liberally used emperor and empire anachronistically and out of its Roman and European context to describe any large state from the past or the present. Such Pre-Roman titles as Great King or King of Kings, used by the Kings of Persia and others, are often considered as the equivalent. Sometimes this reference has even extended to non-monarchically ruled states and their spheres of influence such as the Athenian Empire of the late 5th century BC, the Angevin Empire of the Plantagenets and the Soviet and American "empires" of the Cold War era. However, such "empires" did not need to be headed by an "emperor". Empire became identified instead with vast territorial holdings rather than the title of its ruler by the mid-18th century.

For purposes of protocol, emperors were once given precedence over kings in international diplomatic relations, but currently precedence among heads of state who are sovereigns—whether they be kings, queens, emperors, empresses, princes, princesses and, to a lesser degree, presidents—is determined by the duration of time that each one has been continuously in office. Outside the European context, emperor was the translation given to holders of titles who were accorded the same precedence as European emperors in diplomatic terms. In reciprocity, these rulers might accredit equal titles in their native languages to their European peers. Through centuries of international convention, this has become the dominant rule to identifying an emperor in the modern era.

Roman and Byzantine emperors

Classical Antiquity

When Republican Rome turned into a ''de facto'' monarchy in the second half of the 1st century BC, at first there was no name for the title of the new type of monarch. Ancient Romans abhorred the name Rex ("king"), and it was critical to the political order to maintain the forms and pretenses of republican rule. Julius Caesar had been Dictator, an acknowledged and traditional office in Republican Rome. Caesar was not the first to hold it, but following his assassination the term was abhorred in Rome.

Augustus, considered the first Roman emperor, established his hegemony by collecting on himself offices, titles, and honours of Republican Rome that had traditionally been distributed to different people, concentrating what had been distributed power in one man. One of these offices was ''princeps senatus'', ("first man of the Senate") and became changed into Augustus' chief honorific, ''princeps civitatis'' ("first citizen") from which the modern English word and title prince is descended. The first period of the Roman Empire, from 27 BC – AD 284, is called the ''principate'' for this reason. However, it was the informal descriptive of ''Imperator'' ("commander") that became the title increasingly favored by his successors. Previously bestowed on high officials and military commanders who had ''imperium'', Augustus reserved it exclusively to himself as the ultimate holder of all ''imperium''. (''Imperium'' is Latin for the authority to command, one of a various types of authority delineated in Roman political thought.)

Beginning with Augustus, ''Imperator'' appeared in the title of all Roman monarchs through the extinction of the Empire in 1453. After the reign of Augustus' immediate successor Tiberius, being proclaimed ''imperator'' was transformed into the act of accession to the head of state. Other honorifics used by the Roman Emperors have also come to be synonyms for Emperor:

*Caesar (as, for example, in Suetonius' '' Twelve Caesars''). This tradition continued in many languages: in German it became "Kaiser"; in certain Slavic languages it became "Tsar"; in Hungarian it became "Császár", and several more variants. The name derived from Julius Caesar's cognomen "Caesar": this cognomen was adopted by all Roman emperors, exclusively by the ruling monarch after the Julio-Claudian dynasty had died out. In this tradition Julius Caesar is sometimes described as the first Caesar/emperor (following Suetonius). This is one of the most enduring titles: Caesar and its transliterations appeared in every year from the time of Caesar Augustus to the modern era.
*Augustus was the honorific first bestowed on Emperor Augustus: on his death it became an official title of his successor and all Roman emperors after him added it to their name. Although it had a high symbolic value, something like "elevated" or "sublime", it was generally not used to indicate the office of ''Emperor'' itself. Exceptions include the title of the ''Augustan History'', a semi-historical collection of Emperors' biographies of the 2nd and 3rd century. This title also proved very enduring: after the fall of the Roman Empire, the title would be incorporated into the style of the Holy Roman Emperor, a precedent set by Charlemagne, and its Greek translation ''Sebastos'' continued to be used in the Byzantine Empire until the Fall of Constantinople in 1453, although it gradually lost its imperial exclusivity. Augustus had (by his last will) granted the feminine form of this honorific ( Augusta) to his wife. Since there was no "title" of Empress(-consort) whatsoever, women of the reigning dynasty sought to be granted this honorific, as the highest attainable goal. Few were however granted the title, and it was certainly not a rule that all wives of reigning Emperors would receive it.
*Imperator (as, for example, in Pliny the Elder's ''Naturalis Historia''). In the Roman Republic Imperator meant "(military) commander". In the late Republic, as in the early years of the new monarchy, ''Imperator'' was a title granted to Roman generals by their troops and the Roman Senate after a great victory, roughly comparable to field marshal (head or commander of the entire army). For example, in AD 15 Germanicus was proclaimed ''Imperator'' during the reign of his adoptive father Tiberius. Soon thereafter "Imperator" became however a title reserved exclusively for the ruling monarch. This led to "Emperor" in English and, among other examples, "Empereur" in French and "Mbreti" in Albanian. The Latin feminine form Imperatrix only developed after "Imperator" had taken on the connotation of "Emperor".
*Autokrator (Αὐτοκράτωρ) or Basileus (βασιλεύς): although the Greeks used equivalents of "Caesar" (Καῖσαρ, ''Kaisar'') and "Augustus" (in two forms: transliterated as , ''Augoustos'' or translated as , ''Sebastos'') these were rather used as part of the name of the Emperor than as an indication of the office. Instead of developing a new name for the new type of monarchy, they used (''autokratōr'', only partly overlapping with the modern understanding of "autocrat") or (''basileus'', until then the usual name for "sovereign"). ''Autokratōr'' was essentially used as a translation of the Latin ''Imperator'' in Greek-speaking part of the Roman Empire, but also here there is only partial overlap between the meaning of the original Greek and Latin concepts. For the Greeks ''Autokratōr'' was not a military title, and was closer to the Latin ''dictator'' concept ("the one with unlimited power"), before it came to mean Emperor. ''Basileus'' appears not to have been used exclusively in the meaning of "emperor" (and specifically, the Roman/Byzantine emperor) before the 7th century, although it was a standard informal designation of the Emperor in the Greek-speaking East. The title was later applied by the rulers of various Eastern Orthodox countries claiming to be the successors of Rome/Byzantium, such as Georgia, Bulgaria, Serbia, Russia.

After the turbulent Year of the four emperors in 69, the Flavian Dynasty reigned for three decades. The succeeding Nervan-Antonian Dynasty, ruling for most of the 2nd century, stabilised the Empire. This epoch became known as the era of the ''Five Good Emperors'', and was followed by the short-lived Severan Dynasty.

During the Crisis of the 3rd century, Barracks Emperors succeeded one another at short intervals. Three short lived secessionist attempts had their own emperors: the Gallic Empire, the Britannic Empire, and the Palmyrene Empire though the latter used ''rex'' more regularly.

The Principate (27 BC – 284 AD) period was succeeded by what is known as the Dominate (284 AD – 527 AD), during which Emperor Diocletian tried to put the Empire on a more formal footing. Diocletian sought to address the challenges of the Empire's now vast geography and the instability caused by the informality of succession by the creation of co-emperors and junior emperors. At one point, there were as many as five sharers of the ''imperium'' (see: Tetrarchy). In 325 AD Constantine I defeated his rivals and restored single emperor rule, but following his death the empire was divided among his sons. For a time the concept was of one empire ruled by multiple emperors with varying territory under their control, however following the death of Theodosius I the rule was divided between his two sons and increasingly became separate entities. The areas administered from Rome are referred to by historians the Western Roman Empire and those under the immediate authority of Constantinople called the Eastern Roman Empire or (after the Battle of Yarmouk in 636 AD) the Later Roman or Byzantine Empire. The subdivisions and co-emperor system were formally abolished by Emperor Zeno in 480 AD following the death of Julius Nepos last Western Emperor and the ascension of Odoacer as the ''de facto'' King of Italy in 476 AD.

Byzantine period

Before the 4th Crusade

Historians generally refer to the continuing Roman Empire in the east as the Byzantine Empire after Byzantium, the original name of the town that Constantine I would elevate to the Imperial capital as New Rome in AD 330. (The city is more commonly called Constantinople and is today named Istanbul). Although the empire was again subdivided and a co-emperor sent to Italy at the end of the fourth century, the office became unitary again only 95 years later at the request of the Roman Senate and following the death of Julius Nepos, last Western Emperor. This change was a recognition of the reality that little remained of Imperial authority in the areas that had been the Western Empire, with even Rome and Italy itself now ruled by the essentially autonomous Odoacer.

These Later Roman "Byzantine" Emperors completed the transition from the idea of the Emperor as a semi-republican official to the Emperor as an absolute monarch. Of particular note was the translation of the Latin ''Imperator'' into the Greek ''Basileus'', after Emperor Heraclius changed the official language of the empire from Latin to Greek in AD 620. Basileus, a title which had long been used for Alexander the Great was already in common usage as the Greek word for the Roman emperor, but its definition and sense was "King" in Greek, essentially equivalent with the Latin ''Rex''. Byzantine period emperors also used the Greek word "autokrator", meaning "one who rules himself", or "monarch", which was traditionally used by Greek writers to translate the Latin ''dictator''. Essentially, the Greek language did not incorporate the nuances of the Ancient Roman concepts that distinguished ''imperium'' from other forms of political power.

In general usage, the Byzantine imperial title evolved from simply "emperor" (''basileus''), to "emperor of the Romans" (''basileus tōn Rōmaiōn'') in the 9th century, to "emperor and autocrat of the Romans" (''basileus kai autokratōr tōn Rōmaiōn'') in the 10th. In fact, none of these (and other) additional epithets and titles had ever been completely discarded.

One important distinction between the post Constantine I (reigned AD 306–337) emperors and their pagan predecessors was cesaropapism, the assertion that the Emperor (or other head of state) is also the head of the Church. Although this principle was held by all emperors after Constantine, it met with increasing resistance and ultimately rejection by bishops in the west after the effective end of Imperial power there. This concept became a key element of the meaning of "emperor" in the Byzantine and Orthodox east, but went out of favor in the west with the rise of Roman Catholicism.

The Byzantine Empire also produced three women who effectively governed the state: the Empress Irene and the Empresses Zoe and Theodora.

Latin emperors

In 1204 Constantinople fell to the Venetians and the Franks in the Fourth Crusade. Following the tragedy of the horrific sacking of the city, the conquerors declared a new "Empire of Romania", known to historians as the Latin Empire of Constantinople, installing Baldwin IX, Count of Flanders, as Emperor. However, Byzantine resistance to the new empire meant that it was in constant struggle to establish itself. Byzantine Emperor Michael VIII Palaiologos succeeded in recapturing Constantinople in 1261. The Principality of Achaea, a vassal state the empire had created in Morea (Greece) intermittently continued to recognize the authority of the crusader emperors for another half century. Pretenders to the title continued among the European nobility until circa 1383.

After the 4th Crusade

With Constantinople occupied, claimants to the imperial succession styled themselves as emperor in the chief centers of resistance: The Laskarid dynasty in the Empire of Nicaea, the Komnenid dynasty in the Empire of Trebizond and the Doukid dynasty in the Despotate of Epirus. In 1248, Epirus recognized the Nicaean Emperors, who subsequently recaptured Constantinople in 1261. The Trapezuntine emperor formally submitted in Constantinople in 1281, but frequently flouted convention by styling themselves emperor back in Trebizond thereafter.

Holy Roman Empire

The ''Emperor'' of the Romans' title was a reflection of the ''translatio imperii'' (''transfer of rule'') principle that regarded the Holy Roman Emperors as the inheritors of the title of Emperor of the Western Roman Empire, despite the continued existence of the Roman Empire in the east, hence the problem of two emperors.

From the time of Otto the Great onward, much of the former Carolingian kingdom of Eastern Francia became the Holy Roman Empire. The prince-electors elected one of their peers as King of the Romans and King of Italy before being crowned by the Pope. The Emperor could also pursue the election of his heir (usually a son) as King, who would then succeed him after his death. This junior King then bore the title of Roman King (King of the Romans). Although technically already ruling, after the election he would be crowned as emperor by the Pope. The last emperor to be crowned by the pope was Charles V; all emperors after him were technically ''emperors-elect'', but were universally referred to as ''Emperor''.

The Holy Roman Emperor was considered the first among those in power. He was also the first defender of Christianity. From 1452 to the end of the Holy Roman Empire in 1806 (except in the years 1742 to 1745) only members of the House of Habsburg were Holy Roman Emperors. Karl von Habsburg is currently the head of the House of Habsburg.

Austrian Empire

The first Austrian Emperor was the last Holy Roman Emperor, Franz II. In the face of aggressions by Napoleon, Francis feared for the future of the Holy Roman Empire. He wished to maintain his and his family's Imperial status in the event that the Holy Roman Empire should be dissolved, as it indeed was in 1806 when an Austrian-led army suffered a humiliating defeat at the Battle of Austerlitz. After which, the victorious Napoleon proceeded to dismantle the old ''Reich'' by severing a good portion from the empire and turning it into a separate Confederation of the Rhine. With the size of his imperial realm significantly reduced, Francis II, ''Holy Roman Emperor'' became Francis I, ''Emperor of Austria''. The new imperial title may have sounded less prestigious than the old one, but Francis' dynasty continued to rule from Austria and a Habsburg monarch was still an emperor (''Kaiser''), and not just merely a king (''König''), in name. According to the historian Friedrich Heer, the Austrian Habsburg emperor remained an "auctoritas" of a special kind. He was "the grandson of the Caesars", he remained the patron of the Holy Church.

The title lasted just a little over one century until 1918, but it was never clear what territory constituted the "Empire of Austria". When Francis took the title in 1804, the Habsburg lands as a whole were dubbed the ''Kaisertum Österreich''. ''Kaisertum'' might literally be translated as "emperordom" (on analogy with "kingdom") or "emperor-ship"; the term denotes specifically "the territory ruled by an emperor", and is thus somewhat more general than Reich, which in 1804 carried connotations of universal rule. Austria proper (as opposed to the complex of Habsburg lands as a whole) had been part of the Archduchy of Austria since the 15th century, and most of the other territories of the Empire had their own institutions and territorial history. There were some attempts at centralization, especially during the reign of Maria Theresa and her son Joseph II, Holy Roman Emperor. These efforts were finalized in the early 19th century. When the Lands of the Crown of Saint Stephen (Hungary) were given self-government in 1867, the non-Hungarian portions were called the Empire of Austria. They were officially known as the "Kingdoms and Lands Represented in the Imperial Council (''Reichsrat'')". The title of Emperor of Austria and the associated Empire were both abolished at the end World War I in 1918, when German Austria became a republic and the other kingdoms and lands represented in the Imperial Council established their independence or adhesion to other states.

The ''Kaisers'' of the Austrian Empire (1804–1918) were Franz I (1804–1835), Ferdinand I (1835–1848), Franz Joseph I (1848–1916) and Karl I (1916–1918). The current head of the House of Habsburg is Karl von Habsburg.

Emperors of Europe

Byzantium's close cultural and political interaction with its Balkan neighbors Bulgaria and Serbia, and with Russia (Kievan Rus', then Muscovy) led to the adoption of Byzantine imperial traditions in all of these countries.

Bulgaria

In 913, Simeon I of Bulgaria was crowned Emperor (Tsar) by the Patriarch of Constantinople and Imperial regent Nicholas Mystikos outside the Byzantine capital. In its final simplified form, the title read "Emperor and Autocrat of all Bulgarians and Greeks" (''Tsar i samodarzhets na vsichki balgari i gartsi'' in the modern vernacular). The Roman component in the Bulgarian imperial title indicated both rulership over Greek speakers and the derivation of the imperial tradition from the Romans, however this component was never recognised by the Byzantine court.

Byzantine recognition of Simeon's imperial title was revoked by the succeeding Byzantine government. The decade 914–924 was spent in destructive warfare between Byzantium and Bulgaria over this and other matters of conflict. The Bulgarian monarch, who had further irritated his Byzantine counterpart by claiming the title "Emperor of the Romans" (''basileus tōn Rōmaiōn''), was eventually recognized, as "Emperor of the Bulgarians" (''basileus tōn Boulgarōn'') by the Byzantine Emperor Romanos I Lakapenos in 924. Byzantine recognition of the imperial dignity of the Bulgarian monarch and the patriarchal dignity of the Bulgarian patriarch was again confirmed at the conclusion of permanent peace and a Bulgarian-Byzantine dynastic marriage in 927. In the meantime, the Bulgarian imperial title may have been also confirmed by the pope. The Bulgarian imperial title "tsar" was adopted by all Bulgarian monarchs up to the fall of Bulgaria under Ottoman rule. 14th-century Bulgarian literary compositions saw the Bulgarian capital (Tarnovo) as a successor of Rome and Constantinople.

After Bulgaria obtained full independence from the Ottoman Empire in 1908, its monarch, who was previously styled ''Knyaz'', Prince, took the traditional title of ''Tsar'' , this time translates as King. Simeon Saxe-Coburg-Gotha is the former Tsar Simeon II of Bulgaria.

France

The kings of the ''Ancien Régime'' and the July Monarchy used the title ''Empereur de France'' in diplomatic correspondence and treaties with the Ottoman emperor from at least 1673 onwards. The Ottomans insisted on this elevated style while refusing to recognize the Holy Roman Emperors or the Russian tsars because of their rival claims of the Roman crown. In short, it was an indirect insult by the Ottomans to the HRE and the Russians. The French kings also used it for Morocco (1682) and Persia (1715).

First French Empire

Napoleon Bonaparte, who was already First Consul of the French Republic (''Premier Consul de la République française'') for life, declared himself Emperor of the French (''Empereur des Français'') on 18 May 1804, thus creating the First French Empire, French Empire (''Empire Français'').

Napoleon relinquished the title of Emperor of the French on 6 April and again on 11 April 1814.
Napoleon's infant son, Napoleon II of France, Napoleon II, was recognized by the Council of Peers, as Emperor from the moment of his father's abdication, and therefore reigned (as opposed to ruled) as Emperor for fifteen days, 22 June to 7 July 1815.

Elba

Since 3 May 1814, the Sovereign Principality of Elba was created as a miniature non-hereditary Monarchy under the exiled French Emperor Napoleon I. According to the Treaty of Fontainebleau (1814), Napoleon I was allowed to enjoy the imperial title for life. The islands were ''not'' restyled an empire.

On 26 February 1815, Napoleon abandoned Elba for France, reviving the French Empire for a Hundred Days; the Allies declared an end to Napoleon's sovereignty over Elba on 25 March 1815, and on 31 March 1815 Elba was ceded to the restored Grand Duchy of Tuscany by the Congress of Vienna. After his final defeat, Napoleon was treated as a general by the British authorities during his second exile to Atlantic Isle of St. Helena. His title was a matter of dispute with the governor of St Helena, who insisted on addressing him as "General Bonaparte", despite the "historical reality that he had been an emperor" and therefore retained the title.

Second French Empire

Napoleon I's nephew, Napoleon III of France, Napoleon III, resurrected the title of emperor on 2 December 1852, after establishing the Second French Empire in a presidential coup, subsequently approved by a plebiscite. His reign was marked by large scale public works, the development of social policy, and the extension of France's influence throughout the world. During his reign, he also set about creating the Second Mexican Empire (headed by his choice of Maximilian I of Mexico, a member of the House of Habsburg), to regain France's hold in the Americas and to achieve greatness for the 'Latin' race. Napoleon III was deposed on 4 September 1870, after France's defeat in the Franco-Prussian War. The French Third Republic, Third Republic followed and after the death of his son Napoleon (IV), in 1879 during the Zulu War, the Bonapartist movement split, and the Third Republic was to last until 1940.

The role of head of the House of Bonaparte is claimed by Jean-Christophe, Prince Napoléon, Jean-Christophe Napoléon and Charles, Prince Napoléon, Charles Napoléon.

Iberian Peninsula

Spain

The origin of the title ''Imperator totius Hispaniae'' (Latin language, Latin for ''Emperor of All Hispania, Spain'') is murky. It was associated with the List of Leonese monarchs, Leonese monarchy perhaps as far back as Alfonso the Great (''r.'' 866–910). The last two kings of its Astur-Leonese dynasty were called emperors in a contemporary source.

King Sancho III of Navarre conquered Leon in 1034 and began using it. His son, Ferdinand I of Castile also took the title in 1039. Ferdinand's son, Alfonso VI of León and Castile took the title in 1077. It then passed to his son-in-law, Alfonso I of Aragon in 1109. His stepson and Alfonso VI's grandson, Alfonso VII of Castile, Alfonso VII was the only one who actually had an imperial coronation in 1135.

The title was not exactly hereditary but self-proclaimed by those who had, wholly or partially, united the Christian northern part of the Iberian Peninsula, often at the expense of killing rival siblings. The popes and Holy Roman emperors protested at the usage of the imperial title as a usurpation of leadership in western Christendom. After Alfonso VII's death in 1157, the title was abandoned, and the kings who used it are not commonly mentioned as having been "emperors", in Spanish or other historiography.

After the fall of the Byzantine Empire, the legitimate heir to the throne, Andreas Palaiologos, willed away his claim to Ferdinand and Isabella in 1503.

Portugal

After the independence and proclamation of the Empire of Brazil from the United Kingdom of Portugal, Brazil and the Algarves, Kingdom of Portugal by Pedro I of Brazil, Prince Pedro, who became Emperor, in 1822, his father, King John VI of Portugal briefly held the honorific style of Titular Emperor of Brazil and the treatment of ''His Imperial and Royal Majesty'' under the 1825 Treaty of Rio de Janeiro (1825), Treaty of Rio de Janeiro, by which Portugal recognized the independence of Brazil. The style of Titular Emperor was a life title, and became extinct upon the holder's demise. John VI held the imperial title for a few months only, from the ratification of the Treaty in November 1825 until his death in March 1826. During those months, however, as John's imperial title was purely honorific while his son, Pedro I, remained the sole monarch of the Brazilian Empire. Duarte Pio, Duke of Braganza, Duarte Pio is the current head of the House of Braganza.

Great Britain

In the late 3rd century, by the end of the epoch of the ''barracks emperors'' in Rome, there were two Carausian Revolt, Britannic Emperors, reigning for about a decade. After the end of Roman rule in Britain, the Imperator Cunedda forged the Kingdom of Gwynedd in northern Wales, but all his successors were titled kings and princes.

England

There was no consistent title for the king of England before 1066, and monarchs chose to style themselves as they pleased. Imperial titles were used inconsistently, beginning with Athelstan in 930 and ended with the Norman conquest of England. Empress Matilda (1102–1167) is the only English monarch commonly referred to as "emperor" or "empress", but she acquired her title through her marriage to Henry V, Holy Roman Emperor.

During the rule of Henry VIII of England, Henry VIII the Statute in Restraint of Appeals declared that 'this realm of England is an Empire...governed by one Supreme Head and King having the dignity and royal estate of the imperial Crown of the same'. This was in the context of the divorce of Catherine of Aragon and the English Reformation, to emphasize that England had never accepted the quasi-imperial claims of the papacy. Hence England and, by extension its modern successor state, the United Kingdom of Great Britain and Northern Ireland, is according to English law an Empire ruled by a King endowed with the imperial dignity. However, this has not led to the creation of the ''title'' of Emperor in England, nor in Kingdom of Great Britain, Great Britain, nor in the United Kingdom.

United Kingdom

In 1801, George III of the United Kingdom, George III rejected the title of Emperor when offered. The only period when British monarchs held the title of ''Emperor'' in a dynastic succession started when the title Emperor of India, Empress of India was created for Queen Victoria. The government led by Prime Minister of the United Kingdom, Prime Minister Benjamin Disraeli, 1st Earl of Beaconsfield, Benjamin Disraeli, conferred the additional title upon her by an Act of Parliament, reputedly to assuage the monarch's irritation at being, as a mere Queen, notionally inferior to the emperors of Russia, Germany, and Austria. That included her own daughter (Victoria, Princess Royal, Princess Victoria, who was the wife of the Frederick III, German Emperor, reigning German Emperor). Hence, "Queen Victoria felt handicapped in the battle of protocol by not being an Empress herself". The Indian Imperial designation was also formally justified as the expression of Britain succeeding the former Mughal Empire, Mughal Emperor as suzerain over hundreds of princely states. The Indian Independence Act 1947 provided for the abolition of the use of the title "Emperor of India" by the British monarch, but this was not executed by George VI of the United Kingdom, King George VI until a royal proclamation on 22 June 1948. Despite this, George VI continued as king of India until 1950 and as king of Pakistan until his death in 1952.

The last Empress of India was George VI's wife, Queen Elizabeth The Queen Mother.

German Empire

Under the guise of idealism giving way to realism, German nationalism rapidly shifted from its liberal and democratic character in 1848 to Kingdom of Prussia, Prussian prime minister Otto von Bismarck's authoritarian ''Realpolitik''. Bismarck wanted to unify the rival German states to achieve his aim of a conservative, Prussian-dominated Germany. Three wars led to military successes and helped to convince German people to do this: the Second war of Schleswig against Denmark in 1864, the Austro-Prussian War against Austrian Empire, Austria in 1866, and the Franco-Prussian War against the Second French Empire in 1870–71. During the Siege of Paris (1870-1871), Siege of Paris in 1871, the North German Confederation, supported by its allies from southern Germany, formed the German Empire with the proclamation of the Prussian king Wilhelm I of Germany, Wilhelm I as German Emperor in the Hall of Mirrors at the Palace of Versailles, to the humiliation of the French, who ceased to resist only days later.

After his death he was succeeded by his son Frederick III, German Emperor, Frederick III who was only emperor for 99 days. In the same year his son Wilhelm II, German Emperor, Wilhelm II became the third emperor within a year. He was the last German emperor. After the empire's defeat in World War I the empire, called the German Reich, had a president as head of state instead of an emperor. The use of the word ''Reich'' was abandoned following World War II.

Russia

In 1472, the niece of the last Byzantine emperor, Sophia Paleologue, Sophia Palaiologina, married Ivan III of Russia, Ivan III, grand prince of Moscow, who began championing the idea of Russia being the successor to the Byzantine Empire. This idea was represented more emphatically in the composition the monk Filofej addressed to their son Vasili III of Russia, Vasili III. In 1480, after ending Muscovy's dependence on its overlords of the Great Horde, Ivan III began the usage of the titles Tsar and Autocrat (''samoderzhets''). His insistence on recognition as such by the emperor of the Holy Roman Empire since 1489 resulted in the granting of this recognition in 1514 by Emperor Maximilian I, Holy Roman Emperor, Maximilian I to Vasili III. His son Ivan the Terrible, Ivan IV emphatically crowned himself Tsar of Russia on 16 January 1547. The word "Tsar" derives from Latin Caesar, but this title was used in Russia as equivalent to "King"; the error occurred when medieval Russian clerics referred to the biblical Jewish kings with the same title that was used to designate Roman and Byzantine rulers — "Caesar".

On 31 October 1721, Peter the Great, Peter I was proclaimed Emperor by the Governing Senate. The title used was Latin "''Imperator''", which is a westernizing form equivalent to the traditional Slavic title "''Tsar''". He based his claim partially upon a letter discovered in 1717 written in 1514 from Maximilian I to Vasili III, in which the Holy Roman Emperor used the term in referring to Vasili.

A formal address to the ruling Russian monarch adopted thereafter was 'Your Imperial Majesty'. The crown prince was addressed as 'Your Imperial Highness'.

The title has not been used in Russia since the abdication of Emperor Nicholas II of Russia, Nicholas II on 15 March 1917.

The Russian Empire produced four reigning Empresses, all in the eighteenth century.

The role of head of the House of Romanov is claimed by Grand Duchess Maria Vladimirovna of Russia (Great-great-granddaughter of Alexander II of Russia), Prince Andrew Romanoff (great-great-grandson of Nicholas I of Russia), and Prince Karl Emich of Leiningen (Great-grandson of Grand Duke Kirill Vladimirovich of Russia).

Serbia

In 1345, the Serbian King Stefan Dusan, Stefan Uroš IV Dušan proclaimed himself Emperor (Tsar) and was crowned as such at Skopje on Easter 1346 by the newly created Serbian Patriarch, and by the Patriarch of Bulgaria and the autocephalous Archbishop of Ohrid. His imperial title was recognized by Bulgaria and various other neighbors and trading partners but not by the Byzantine Empire. In its final simplified form, the Serbian imperial title read "Emperor of Serbs and Greeks" (''цар Срба и Грка'' in modern Serbian). It was only employed by Stefan Uroš IV Dušan and his son Stefan Uroš V in Serbia (until his death in 1371), after which it became extinct. A half-brother of Dušan, Simeon Uroš, and then his son Jovan Uroš, claimed the same title, until the latter's abdication in 1373, while ruling as dynasts in Thessaly. The "Greek" component in the Serbian imperial title indicates both rulership over Greeks and the derivation of the imperial tradition from the Romans. A renegade Hungarian-Serb commander, Jovan Nenad, who claimed to be a descendant of Serbian and Byzantine rulers, styled himself Emperor.

Ottoman Empire

List of sultans of the Ottoman Empire, Ottoman rulers held List of Ottoman titles and appellations, many titles and appellations denoting their Imperial status. These included: Sultan, Padishah, and Khan (title), Khan.

The full style of the Ottoman sultan once the empire's frontiers had stabilized became:

After the Capture of Constantinople, Ottoman capture of Constantinople in 1453, the Ottoman sultans began to style themselves Kaysar-i Rum (Ceaser of the Romans) as they asserted themselves to be the heirs to the Roman Empire by right of conquest. The title was of such importance to them that it led them to eliminate the various Byzantine successor states – and therefore rival claimants – over the next eight years. Though the term "emperor" was rarely used by Westerners of the Ottoman sultan, it was generally accepted by Westerners that he had imperial status.

Harun Osman is currently the head of the Ottoman dynasty.

Emperors in the Americas

Pre-Columbian traditions

The Aztec and Inca traditions are unrelated to one another. Both were conquered under the reign of King Charles I of Spain who was simultaneously emperor-elect of the Holy Roman Empire during the fall of the Aztecs and fully emperor during the fall of the Incas. Incidentally by being king of Spain, he was also Roman (Byzantine) emperor in pretence through Andreas Palaiologos. The translations of their titles were provided by the Spanish.

Aztec Empire

The only pre-Columbian North American rulers to be commonly called emperors were the ''Huey Tlatoani'' of the Mexica city-states of Tenochtitlan, Tlacopan and Texcoco (altepetl), Texcoco, which along with their allies and tributaries are popularly known as the Aztec Empire (1375–1521). ''Tlatoani'' is a generic Nahuatl word for "ruler"; however, most English translators use "king" for their translation, thus rendering ''huey tlatoani'' as ''great king'' or ''emperor.''

The Triple Alliance was an elected monarchy chosen by the elite. The Emperors of Tenochtitlan and Texcoco were nominally equals, each receiving two-fifths of tribute from the vassal kingdoms, whereas the Emperor of Tlacopan was a junior member and only received one-fifth of the tribute, due to the fact that Tlacopan was a newcomer to the alliance. Despite the nominal equality, Tenochtitlan eventually assumed a de facto dominant role in the Empire, to the point that even the Emperors of Tlacopan and Texcoco would acknowledge Tenochtitlan's effective supremacy. Spanish conquistador Hernán Cortés slew Emperor Cuauhtémoc and installed puppet rulers who became vassals for Spain.

Inca Empire

The only pre-Columbian South American rulers to be commonly called emperors were the ''Sapa Inca'' of the Inca Empire (1438–1533). Spanish conquistador Francisco Pizarro, conquered the Inca for Spain, killed Emperor Atahualpa, and installed puppets as well. Atahualpa may actually be considered a usurper as he had achieved power by Inca Civil War, killing his half-brother and he did not perform the required coronation with the imperial crown ''mascaipacha'' by the ''Huillaq Uma'' (high priest).

Post-Columbian Americas

Brazil

When Napoleon, Napoleon I ordered the invasion of Portugal in 1807 because it refused to join the Continental System, the Portuguese House of Braganza, Braganzas moved their capital to Rio de Janeiro to avoid the fate of the Spanish Bourbons (Napoleon I arrested them and made his brother Joseph Bonaparte, Joseph king). When the French general Jean-Andoche Junot arrived in Lisbon, the Portuguese fleet had already left with all the local elite.

In 1808, under a British naval escort, the fleet arrived in Brazil. Later, in 1815, the Portuguese Prince Regent (since 1816 John VI of Portugal, King João VI) proclaimed the United Kingdom of Portugal, Brazil and the Algarves, as a union of three kingdoms, lifting Brazil from its colonial status.

After the fall of Napoleon I and the liberal Wars, Liberal revolution in Portugal, the Portuguese royal family returned to Europe (1821). Prince Pedro of Braganza (King João's older son) stayed in South America acting as regent of the local kingdom, but, two years later in 1822, he proclaimed himself Peter I of Brazil, Pedro I, first Emperor of Brazil. He did, however, recognize his father, João VI, as ''Titular Emperor of Brazil'' —a purely honorific title—until João VI's death in 1826.

The empire came to an end in 1889, with the overthrow of Pedro II of Brazil, Emperor Pedro II (Pedro I's son and successor), when the Brazilian republic was proclaimed.

Today the headship of the Brazilian imperial family, Imperial House of Brazil is disputed between two branches of the House of Orléans-Braganza.

Haiti

Haiti was declared an empire by its ruler, Jean-Jacques Dessalines, who made himself Jacques I, on 20 May 1805. He was assassinated the next year. Haiti again became an empire from 1849 to 1859 under Faustin Soulouque.

Mexico

In Mexico, the First Mexican Empire was the first of two empires created. After the Declaration of Independence of the Mexican Empire, declaration of independence on 15 September 1821, it was the intention of the Mexican parliament to establish a commonwealth whereby the King of Spain, Fernando VII of Spain, Ferdinand VII, would also be Emperor of Mexico, but in which both countries were to be governed by separate laws and with their own legislative offices. Should the king refuse the position, the law provided for a member of the House of Bourbon to accede to the Mexican throne.

Ferdinand VII, however, did not recognize the independence and said that Spain would not allow any other European prince to take the throne of Mexico. By request of Parliament, the president of the regency Agustín de Iturbide was proclaimed emperor of Mexico on 12 July 1822 as Agustín I. Agustín de Iturbide was the general who helped secure Mexican independence from Spanish rule, but was overthrown by the Plan of Casa Mata.

In 1863, the invading French, under Napoleon III (see above), in alliance with Mexican conservatives and Mexican nobility, nobility, helped create the Second Mexican Empire, and invited Archduke Maximilian, of the House of Lorraine, House of Habsburg-Lorraine, younger brother of the Austrian Emperor Franz Joseph I of Austria, Franz Josef I, to become emperor Maximilian of Mexico, Maximilian I of Mexico. The childless Maximilian and his consort Charlotte of Belgium, Empress Carlota of Mexico, daughter of Leopold I of Belgium, adopted Agustín's grandsons Agustin and Salvador as his heirs to bolster his claim to the throne of Mexico. Maximilian and Carlota made Chapultepec Castle their home, which has been the only palace in North America to house sovereigns. After the withdrawal of French protection in 1867, Maximilian was captured and executed by the liberal forces of Benito Juárez.

This empire led to French influence in the Mexican culture and also French Mexican, immigration from France, Belgium, and Switzerland to Mexico. Maximilian's closest living agnatic relative is Karl von Habsburg, the head of the House of Habsburg.

Persia (Iran)

In Iran, Persia, from the time of Darius the Great, Persian rulers used the title "King of Kings" (''Shahanshah'' in Persian) since they had dominion over peoples from the borders of India to the borders of Greece and Egypt. Alexander the Great probably crowned himself ''shahanshah'' after conquering Persia, bringing the phrase ''basileus ton basileon'' to Greek. It is also known that Tigranes the Great, king of Armenia, was named as the king of kings when he made his empire after defeating the Parthian Empire, Parthians. Georgian title "mephet'mephe" has the same meaning.

The last ''shahanshah'' (Mohammad Reza Pahlavi) was ousted in 1979 following the Iranian Revolution. ''Shahanshah'' is usually translated as ''king of kings'' or simply ''king'' for ancient rulers of the Achaemenid, Arsacid Empire, Arsacid, and Sassanid dynasties, and often shortened to ''shah'' for rulers since the Safavid dynasty in the 16th century. Iranian rulers were typically regarded in the West as emperors.

South Asia

The sanskrit equivalents for emperor titles are:

* Samraat (Another word is ''sārvabhaumā'')
* Chakravarti Samraat

''Samraat'' refers to the king of kings, meaning that he is not only a sovereign ruler but also has feudatories. Chakravarti literally means the ruler, the wheels of whose chariot roll everywhere without obstruction. This word has been used as an epithet of various Vedic deities, like Varuna, and has been attested in the Rigveda, Rig-Veda.

In the later Vedic age, a Samraat was only called Chakravarti Samraaṭ after performing the Vedic Ashwamedha yagya, enabling him by religious tradition to claim superiority over the other kings and princes. A Chakravartī was always considered a Samraat, but the inverse was not always true. The feminine form of chakravarti is chakravartini.

The title of ''Samraaṭ'' has been used by many rulers of the Indian subcontinent. Most historians call Chandragupta Maurya the first ''samraaṭ'' (emperor) of the Indian subcontinent, because of the huge empire he ruled. Other dynasties that are considered imperial by historians are the Chahamanas of Shakambhari, Chauhans, Tomara dynasty, Tomars, Gupta Empire, Guptas, Vijayanagara Empire, Vijayanagara, Kakatiya Empire, Kakatiya, Hoysala Empire, Hoysala and the Chola Dynasty, Cholas.

The title of ''Maharaja'', meaning Great King in Sanskrit were also used by emperors in South and Southeast Asia. The female equivalent of ''Maharaja'' is ''Maharani''

From the 14th century until the 19th century the Indian subcontinent was dominated by predominantly Muslim rulers first the Delhi Sultanate and then the Mughal Empire. Its rulers used the title Padishah (or Badshah). Towards the end of Mughal rule, the Maratha Empire was established and its rulers used the title Chhatrapati. When the British ruled over India, they adopted the additional title of Kaisar-i-Hind.

Africa

Ethiopia

From 1270 the Solomonic dynasty of Ethiopian Empire, Ethiopia used the title , literally "King of Kings". The use of the ''king of kings'' style began a millennium earlier in this region, however, with the title being used by the Kings of Kingdom of Aksum, Aksum, beginning with Sembrouthes in the 3rd century.

Another title used by this dynasty was . translates as Empress, and was used by the only reigning Empress, Zauditu of Ethiopia, Zauditu, along with the official title ("Queen of Kings").

In 1936, the Italian king Victor Emmanuel III of Italy, Victor Emmanuel III claimed the title of Emperor of Ethiopia after Ethiopia was occupied by Italy during the Second Italo-Abyssinian War. After the defeat of the Italians by the British and the Ethiopians in 1941, Haile Selassie I of Ethiopia, Haile Selassie was restored to the throne but Victor Emmanuel did not relinquish his claim even though he had no standing to the title until 1943.

The current head of the Solomonic dynasty is Zera Yacob Amha Selassie.

Central African Empire

In 1976, President Jean-Bédel Bokassa of the Central African Republic, proclaimed the country to be an autocratic Central African Empire, and made himself Emperor as Bokassa I. The expenses of his coronation ceremony actually bankrupted the country. He was overthrown three years later and the republic was restored.

East Asian tradition

The rulers of China and (once Westerners became aware of the role) Japan were always accepted in the West as emperors, and referred to as such. The claims of other East Asian monarchies to the title may have been accepted for diplomatic purposes, but it was not necessarily used in more general contexts.

China

The East Asian tradition is different from the Roman tradition, having arisen separately. What links them together is the use of the Chinese logographs 皇 (''huáng'') and 帝 (''dì'') which together or individually are imperial. Because of the cultural influence of China, China's neighbors adopted these titles or had their native titles conform in ''hanzi''. Anyone who spoke to the emperor was to address the emperor as bìxià (陛下, lit. the "Bottom of the Steps"), corresponding to the Imperial Majesty (style), Imperial Majesty"; shèngshàng (聖上, lit. Holy Highness); or wànsuì (萬歲, lit. "You, of Ten Thousand Years").

In 221 BC, Qin Shi Huang, Ying Zheng, who was Chinese sovereign, king of Qin Dynasty, Qin at the time, proclaimed himself ''Shi Huangdi'' (始皇帝), which translates as "first emperor". ''Huangdi'' is composed of ''huang'' ("august one", 皇) and ''di'' ("sage-king", 帝), and referred to legendary/mythological Three Sovereigns and Five Emperors, sage-emperors living several millennia earlier, of which three were ''huang'' and five were ''di''. Thus Ying Zheng became Qin Shi Huang, abolishing the system where the ''huang''/''di'' titles were reserved to dead and/or mythological rulers. Since then, the title "king" became a lower ranked title, and later divided into two grades. Although not as popular, the title 王 ''wang'' (king or prince) was still used by many monarchs and dynasties in China up to the Taiping Rebellion, Taipings in the 19th century. 王 is pronounced ''vương'' in Vietnamese, ''ō'' in Japanese, and ''wang'' in Korean.

The imperial title continued in China until the Qing Dynasty was overthrown in 1912. The title was briefly revived from 12 December 1915 to 22 March 1916 by President Yuan Shikai and again in early July 1917 when General Zhang Xun (Qing loyalist), Zhang Xun attempted to restore last Qing emperor Puyi to the throne. Puyi retained the title and attributes of a foreign emperor, as a personal status, until 1924. After the Japanese occupied Manchuria in 1931, they proclaimed it to be the Empire of Manchukuo, and Puyi became emperor of Manchukuo. This empire ceased to exist when it was occupied by the Soviet Red Army in 1945.

In general, an emperor would have one empress (''Huanghou'', 皇后) at one time, although posthumous entitlement to empress for a concubines, concubine was not uncommon. The earliest known usage of ''huanghou'' was in the Han Dynasty. The emperor would generally select the empress from his concubines. In subsequent dynasties, when the distinction between wife and concubine became more accentuated, the crown prince would have chosen an empress-designate before his reign. Early Imperial China, Imperial China produced only one reigning empress, Wu Zetian, and she used the same Chinese title as an emperor (''Huangdi'', 皇帝). Wu Zetian then reigned for about 15 years (AD 690–705).

Under the tributary system of China, monarchs of Korea and Vietnam sometimes called themselves ''emperor'' in their country. They introduced themselves as ''king'' for China and other countries (Emperor at home, king abroad). In Japan, Ashikaga Yoshimitsu a Shogun was granted title of ''King of Japan'' for trade by the Ming emperor. However, the Shogun was a subject of the Japanese Emperor. It was contrary to rules of tributary system, but the Ming emperor connived it for the purpose of suppressing the Wokou.

Japan

The earliest Emperor recorded in Kojiki and Nihon Shoki is Emperor Jimmu, who is said to be a descendant of Amaterasu's grandson Ninigi who descended from Heaven (Tenson kōrin). If one believes what is written in Nihon Shoki, the Emperors have an unbroken direct male lineage that goes back more than 2,600 years.

In ancient Japan, the earliest titles for the sovereign were either ヤマト大王/大君 (''yamato ōkimi'', Grand King of Yamato), 倭王/倭国王 (''waō''/''wakokuō'', King of Wa, used externally), or 治天下大王 (''amenoshita shiroshimesu ōkimi'', Grand King who rules all under heaven, used internally).

In 607, Empress Suiko sent a diplomatic document to China, which she wrote "the emperor of the land of the rising sun (日出處天子) sends a document to the emperor of the land of the setting sun (日沒處天子)" and began to use the title emperor externally. As early as the 7th century, the word 天皇 (which can be read either as ''sumera no mikoto'', divine order, or as ''tennō'', Heavenly Emperor, the latter being derived from a Tang Chinese term referring to the Pole star around which all other stars revolve) began to be used. The earliest use of this term is found on a wooden slat, or ''mokkan'', unearthed in Asuka-mura, Nara Prefecture in 1998. The slat dated back to the reign of Emperor Tenmu and Empress Jitō. The reading 'Tennō' has become the standard title for the Japanese sovereign up to the present age. The term 帝 (''mikado'', Emperor) is also found in literary sources.

In the Japanese language, the word ''tennō'' is restricted to Japan's own monarch; ''kōtei'' (皇帝) is usually used for foreign emperors. Historically, Daijō-tennō, retired emperors often kept power over a child-emperor as de facto regent. For a long time, a ''shōgun'' (formally the imperial Military dictatorship, military dictator, but made hereditary) or an Sesshō and Kampaku, imperial regent wielded actual political power. In fact, through much of Japanese history, the emperor has been little more than a figurehead. The Meiji Restoration restored practical abilities and the political system under Emperor Meiji.Henry Kissinger on China. 2011 p.79 The last shogun Tokugawa Yoshinobu resigned in 1868.

After World War II, all claims of divinity were dropped (see Ningen-sengen). The Diet acquired all prerogative powers of the Crown, reverting the latter to a ceremonial role. By 1979, after the short-lived Central African Empire (1976-1979), Hirohito, Emperor Shōwa was the only monarch in the world with the title emperor.

As of the early 21st century, Japan's succession law prohibits a female from ascending the throne. With the birth of a Aiko, Princess Toshi, daughter as the first child of the then-Crown Prince Naruhito, Japan Naruhito#Marriage and family, considered abandoning that rule. However, shortly after the announcement that Kiko, Princess Akishino, Princess Kiko was pregnant with her third child, the proposal to alter the Imperial Household Law was suspended by then-Prime Minister Junichiro Koizumi. On 3 January 2007, as the child turned out to be a Prince Hisahito of Akishino, son, Prime Minister Shinzō Abe announced that he would drop the proposal.

Emperor Naruhito is the 126th monarch according to Japan's List of Emperors of Japan, traditional order of succession. The second and third in line of succession are Fumihito, Prince Akishino and Prince Hisahito. Historically, Japan has had eight reigning empresses who used the genderless title ''Tennō'', rather than the female consort title ''kōgō'' (皇后) or ''chūgū'' (中宮). There is ongoing discussion of the Japanese Imperial succession controversy. Although current Japanese law prohibits female succession, all Japanese emperors claim to trace their lineage to ''Amaterasu'', the Sun Goddess of the Shinto, Shintō religion. Thus, the Emperor is thought to be the highest authority of the Shinto religion, and one of his duties is to perform Shinto rituals for the people of Japan.

Korea

Some rulers of Goguryeo (37 BC–AD 668) used the title of ''Taewang'' (), literally translated as "Greatest King". The title of ''Taewang'' was also used by some rulers of Silla (57 BC–AD 935), including Beopheung of Silla, Beopheung and Jinheung of Silla, Jinheung.

The rulers of Balhae (698–926) internally called themselves ''Seongwang'' (; lit. "Holy King").

The rulers of Goryeo (918–1392) used the titles of emperor and ''Son of Heaven of the East of the Ocean'' (). Goryeo's imperial system ended in 1270 with capitulation to the Mongol Empire.

In 1897, Gojong of Korea, Gojong, the King of Joseon, proclaimed the founding of the Korean Empire (1897–1910), becoming the Emperor of Korea. He declared the Korean era name, era name of "Gwangmu" (), meaning "Bright and Martial". The Korean Empire lasted until 1910, when it was annexed by the Empire of Japan.

Mongolia

The title Khagan (Khan (title), khan of khans or grand khan) was held by Genghis Khan, founder of the Mongol Empire in 1206; he also formally took the Chinese title Emperor of China, ''huangdi'', as "Genghis Emperor" ( ). Only the Khagans from Genghis Khan to the fall of the Yuan dynasty in 1368 are normally referred to as Emperors in English.

Vietnam

Đại Việt, Đại Việt Kingdom (40–43, 544–602, 938–1407, 1427–1945) (The first ruler of Vietnam to take the title of Emperor (Hoàng Đế) was the founder of the Early Lý dynasty, Lý Nam Đế, in the year AD 544)

Ngô Quyền, the first ruler of Đại Việt as an independent state, used the title ''Vương'' (王, ''King''). However, after the death of Ngô Quyền, the country immersed in a civil war known as Anarchy of the 12 Warlords that lasted for over 20 years. In the end, Đinh Bộ Lĩnh unified the country after defeating all the warlords and became the first ruler of Đại Việt to use the title ''Hoàng Đế'' (皇帝, ''Emperor'') in 968. Succeeding rulers in Vietnam then continued to use this Emperor title until 1806 when this title was stopped being used for a century.

Đinh Bộ Lĩnh was not the first to claim the title of ''Đế'' (帝, ''Emperor''). Before him, Lý Bí and Mai Thúc Loan also claimed this title. However, their rules were short-lived.

The Vietnamese emperors also gave this title to their ancestors who were lords or influential figures in the previous dynasty, as did the Chinese emperors. This practice was one of the many indications that Vietnam considered itself an equal to China which remained intact up to the twentieth century.

In 1802 the newly established Nguyễn dynasty requested canonization from the Chinese Jiaqing Emperor and received the title ''Quốc Vương'' (國王, ''King of a State)'' and the name of the country as ''Việt Nam'' (越南) instead ''Đại Việt'' (大越). To avoid unnecessary armed conflicts, the Vietnamese rulers accepted this in diplomatic relation and Emperor at home, king abroad, used the title Emperor only domestically. However, Vietnamese rulers never accepted the vassalage relationship with China and always refused to come to Chinese courts to pay homage to Chinese rulers (a sign of vassalage acceptance). China waged a number of wars against Vietnam throughout history, and after each failure, settled for the tributary relationship. The Yuan dynasty under Kublai Khan waged three wars against Vietnam to force it into a vassalage relationship but after successive failures, Kublai Khan's successor, Temür Khan, finally settled for a tributary relationship with Vietnam. Vietnam sent tributary missions to China once in three years (with some periods of disruptions) until the 19th century, Sino-French War France replaced China in control of northern Vietnam.

The emperors of the last dynasty of Vietnam continued to hold this title until the French conquered Vietnam. The emperor, however, was then a puppet figure only and could easily be disposed of by the French for more pro-France figure. Japan took Vietnam from France and the Axis powers, Axis-occupied Vietnam was declared an Empire of Vietnam, empire by the Japanese in March 1945. The line of emperors came to an end with Bảo Đại, who was deposed after the war, although he later served as head of state of South Vietnam from 1949 to 1955.

Fictional uses

There have been many fictional emperors in movies and books. To see a list of these emperors, see :Fictional emperors and empresses, Category of fictional emperors and empresses.

See also

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Notes

References

External links

Ian Mladjov's site at University of Michigan


Monarchs (chronology and genealogy)

Monarchs (more genealogy)

{{Authority control

Emperors,
Heads of state
Political philosophy
Imperial titles
Gendered occupations