Byzantine People Of Georgian Descent

The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinople. It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until the fall of Constantinople to the Ottoman Empire in 1453. During most of its existence, the empire remained the most powerful economic, cultural, and military force in Europe. The terms "Byzantine Empire" and "Eastern Roman Empire" were coined after the end of the realm; its citizens continued to refer to their empire as the Roman Empire, and to themselves as Romans—a term which Greeks continued to use for themselves into Ottoman times. Although the Roman state continued and its traditions were maintained, modern historians prefer to differentiate the Byzantine Empire from Ancient Rome as it was centred on Constantinople, oriented towards Greek rather than Latin culture, and characterised by Eastern Orthodox Christianity.

During the high period of the Roman Empire known as the Pax Romana, the western parts of the empire went through Latinization, while the eastern parts of the empire maintained to a large degree their Hellenistic culture. Several events from the 4th to 6th centuries mark the period of transition during which the Roman Empire's Greek East and Latin West diverged. Constantine I () reorganised the empire, made Constantinople the capital, and legalised Christianity. Under Theodosius I (), Christianity became the state religion, and other religious practices were proscribed. In the reign of Heraclius (), the empire's military and administration were restructured, and Greek was gradually adopted for official use in place of Latin.

The borders of the empire fluctuated through several cycles of decline and recovery. During the reign of Justinian I (), the empire reached its greatest extent after the fall of the west, re-conquering much of the historically Roman western Mediterranean coast, including Africa, Italy and Rome, which it held for two more centuries. The Byzantine–Sasanian War of 602–628 exhausted the empire's resources, and during the early Muslim conquests of the 7th century, it lost its richest provinces, Egypt and Syria, to the Rashidun Caliphate. It then lost Africa to the Umayyads in 698, before the empire was rescued by the Isaurian dynasty.

During the Macedonian dynasty (9th–11th centuries), the empire expanded again and experienced the two-century-long Macedonian Renaissance, which came to an end with the defeat by Seljuk Turks at the Battle of Manzikert in 1071. Civil wars and the ensuing Seljuk invasion led to the loss of most of Asia Minor. The empire recovered during the Komnenian restoration, and by the 12th century, Constantinople was the largest and wealthiest city in Europe.

The empire was delivered a mortal blow during the Fourth Crusade when Constantinople was sacked in 1204 and the territories that the empire formerly governed were divided into competing Byzantine Greek and Latin realms. Despite the eventual recovery of Constantinople in 1261, the Byzantine Empire remained only one of several small rival states in the area for the final two centuries of its existence. Its remaining territories were progressively annexed by the Ottomans in the Byzantine–Ottoman wars over the 14th and 15th centuries.

The fall of Constantinople to the Ottoman Empire in 1453 marked the end of the Byzantine Empire. Refugees fleeing the city after its capture would settle in Italy and other parts of Europe, helping to ignite the Renaissance. The Empire of Trebizond was conquered eight years later when its eponymous capital surrendered to Ottoman forces after it was besieged in 1461. The last Byzantine rump state, the Principality of Theodoro, was conquered by the Ottomans in 1475. Arguments can be made that the fall of the Byzantine Empire to the Ottomans is one of several factors contributing to the end of the Middle Ages and the start of the early modern period.

Nomenclature

Historians first used the term "Byzantine" as a label for the later years of the Roman Empire in 1557, 104 years after the empire's collapse, when the German historian Hieronymus Wolf published his work ''Corpus Historiæ Byzantinæ'', a collection of historical sources. According to Anthony Kaldellis, Athenian historian Laonikos Chalkokondyles in the mid 15th century advocated a neo-Hellenic identity of the Romans and was the first to use the term in this way. The term comes from " Byzantium", the name of the city to which Constantine moved his capital, leaving Rome, and rebuilt under the new name of Constantinople. The older name of the city was rarely used from this point onward except in historical or poetic contexts. The publication in 1648 of the ''Byzantine du Louvre'' (''Corpus Scriptorum Historiae Byzantinae''), and in 1680 of Du Cange's ''Historia Byzantina'' further popularised the use of "Byzantine" among French authors, such as Montesquieu. However, it was not until the mid-19th century that the term came into general use in the Western world. Kaldellis claims this was a result of politics of the Crimean War, which included Greece's Megali Idea.

The Byzantine Empire was known to its inhabitants as the "Roman Empire" or the "Empire of the Romans" (; ), Romania (; ), the Roman Republic (; ), or in Greek "Rhōmais" (). The inhabitants called themselves ''Romaioi,'' and even as late as the 19th century Greeks typically referred to Modern Greek as ''Romaiika'' "Romaic". After 1204, when the Byzantine Empire was mostly confined to its purely Greek provinces, the term 'Hellenes' was increasingly used instead.

While the Byzantine Empire had a multi-ethnic character during most of its history and preserved Romano-Hellenistic traditions, it became identified by its western and northern contemporaries with its increasingly predominant Greek element. The ''Libri Carolini'' published in the 790s made the first mention of the term "Empire of the Greeks" (Latin: ''Imperium Graecorum'') and ''Imperator Graecorum'' (Emperor of the Greeks), which was an insult first formally attributed to Pope John XIII, with western medieval sources thereafter using the same terminology. This was done to reestablish equal imperial dignity to the Empire of the Franks and what would later become known as the Holy Roman Empire.

No such distinction existed in the Islamic and Slavic worlds, where the empire was more straightforwardly seen as the continuation of the Roman Empire. In the Islamic world, the Roman Empire was known primarily as ''Rûm''. The name millet-i Rûm, or "''Roman nation,''" was used by the Ottomans until the 20th century to refer to the former subjects of the Byzantine Empire, that is, the Orthodox Christian community within Ottoman realms.

History

Early Byzantine History

The following subchapters describe the transition from the pagan, multicultural Roman Empire ruled from Rome, to the Byzantine Empire, a continuation of the Roman Empire with Latin-inspired administration but culturally predominantly Greek and ruled from Constantinople.

Early history of the Greek-Roman east

During the fourth century BC, Alexander the Great conquered the Achaemenid Empire which brought huge swathes of land from the eastern part of Mediterranean Basin all the way to the Indus river under Greek influence. When Alexander died in 323 BC, much of the land his Macedonian Empire had conquered was split into successor kingdoms known as the "Diadochi", that almost immediately entered into wars against each other known as the Diadochi wars. These Diadochi kingdoms went through different degrees of Hellenisation over the centuries and created a Hellenistic world across the eastern Mediterranean basin. During the 4th century BC, the Roman Republic was a city-state in the Italian region of Latium that, through wars and treaties, expanded its influence across the Italian peninsula. At the start of the 3rd century BC, Rome had emerged victorious from the Samnite wars and was at that point the dominant hegemon of the peninsula, though Rome had yet to be challenged by another great power. This changed with first the Pyrrhic war that saw the Greek Kingdom of Epirus intervening in a war against Rome to protect the Greek city-states of southern Italy. Later, Rome clashed with Carthage in a series of wars known as the Punic wars from 264 BC onward, which in the Second Punic War saw Macedon entering the conflict on the side of Carthage. When the Roman Republic brought the Punic Wars to a close in 146 BC with the sack of Carthage, it also brought half a century of Roman-Greek wars that was running parallel to the Punic Wars to a close with the Sack of Corinth.

By the end of the Roman-Greek Wars, Rome had conquered and incorporated Macedonia, parts of Thrace, and the rest of Greece into the provinces Macedonia and Achaia under the direct rule of the Rome. 13 years later in 133 BC, the king of Pergamon Attalus III died and bequeathed the whole of his kingdom to Rome in order to avoid another bloody conquest. This gained Rome the province of Roman Asia and a permanent foothold in the east. Rome had by these conquests, started a centuries-long process of incorporating much of the Hellenised eastern parts of the Mediterranean basin under Roman rule, with the first Roman emperor Augustus' conquest of Egypt being the most notable. These contacts with the Greeks in the east ended up in the Roman conquest of Greece, but also led to the intertwining of the Roman and Greek worlds. By the second century AD, the Roman Empire reached its height during the reign of emperor Hadrian in a period known as Pax Romana. Rome had conquered territories covering the Balkans, Asia Minor the whole Mediterranean basin and coastal regions in southwestern Europe, Gaul and Britannia and large swathes of North Africa. These territories were home to many different cultural groups, both urban populations and rural populations. The western parts of the Roman Empire went through Romanization while the eastern Hellenised parts of the empire kept much of their Hellenistic culture intact.

Generally speaking, the eastern Mediterranean provinces were more urbanised and developed than the western provinces, having previously been united under the Macedonian Empire and Hellenised by the influence of Greek culture.; . The emperor, during the period of Pax Romana, reigned in a system known as the Principate that kept the veneer of republican constitution alive in the minds of the Romans, with the emperor known as princeps civitatis, derived from a senatorial title Princeps Senatus "the first among equals" in the Senate. The emperor was known as "first among equals" in terms of all Roman citizens. The hallmark of the Principate form of government was the combination of republican institutions with that of an informal monarchical regime. The regime also often ruled its conquered provinces with a few hundred roman provincial administrators, whose authority was above the local rulers and their already established power structure, which was left in place after the conquest. This was common, especially in the eastern Greek provinces of the Roman empire.

Crisis of the third century and reforms of the empire

The third century AD showed some remarkable development for the empire as well as a potential decline and collapse. Emperor Caracallas edict in 212 AD known as the Antoninian constitution delivered Roman citizenship to every free man in the empire, starting the decline of the importance of the city of Rome and indeed of Roman Italy for the Roman Empire. By the mid-third century AD, Pax Romana had come to an end, and several crises hit the empire simultaneously in a period known to history as the Crisis of the third century. This period saw the empire exposed to rampant inflation, natural disasters, secession and civil wars taking places over several decades. The secession's ended with emperor Aurelian’s conquest of the secessionist Palmyrene Empire and Gallic Empire in 273 and 274 AD, as Aurelian unified a splintered empire which, according to many historians, should have been doomed. However, Aurelian was assassinated in 276 AD, sparking additional civil wars. The crisis only came to an end through the ascension of emperor Diocletian to the throne. The West suffered more heavily from these decades of crisis due to this distinction between the established and more prosperous Hellenised East and the younger colonized and Romanized West that had persisted. This cultural division of the Roman Empire into an eastern Greek and western Latin part became increasingly important in later centuries, leading to a gradual estrangement of the two Roman worlds.

Emperor Diocletian created the administrative system known as the Dominate to guarantee security in all endangered regions of his empire. The dominate was in comparison with the principate, a huge imperial bureaucracy, which laid the foundations for the power structure of the later Eastern Roman Empire. With this came a redistricting and reduction of Roman provinces. Diocletian scrapped any pretense of republican rule as the emperor moved away from formally being merely "Princeps" to being "Dominus" - Lord and master. Diocletian also formally finished the process of restructuring the empire, from being a colonial-styled empire ruled by Rome and Roman Italians in the first century AD to a larger imperial entity where the emperor's court was not bound to the city of Rome or Italy, now only one Roman imperial province among many. The norm of emperors being Roman Italians was first broken by emperor Trajan who came from Hispania. By the time of the Severan dynasty, most emperors were originating from outside of Italy. When Diocletian introduced his reforms, this had the effect of the Roman Senate formally lost its already declining imperial influence and became a de facto regional body of decision-making.

An early instance of the partition of the empire into East and West occurred in 286, when Emperor Diocletian appointed Maximian as ''augustus'' of the West. In 293 AD, the empire went through a devolution under Diocletian known as the Tetrarchy. The empire was split into four, with the two most prominent parts of the empire each ruled by one emperor (''Augustus''). Each co-emperor then appointed a young colleague as ''caesar'' to be a subordinate emperor with control over his own territory. The Caesar shared power with and would eventually succeed the senior partner. Each tetrarch was in charge of a part of the empire, with the divisions based on geographic regions. This devolution outlines the coming split 100 years later when the empire was permanently divided into an eastern and western empire. The tetrarchy however only lasted 20 years, as emperors quickly began fighting each other for power. The whole empire was eventually reunited by Constantine the Great in 324 after he ended the last of these civil wars.; .

Christianisation and partition of the empire

In 330, Constantine moved the seat of the empire to Constantinople, which he founded as a second Rome on the site of Byzantium, a city strategically located on the trade routes between Europe and Asia and between the Mediterranean and the Black Sea. Constantine introduced substantial changes to the empire's military, monetary, civil and religious institutions. In regards to his economic policies he has been accused by certain scholars of "reckless fiscality", but the gold solidus he introduced became a stable currency that transformed the economy and promoted development.; ; ;

Under Constantine, Christianity did not become the exclusive religion of the state but enjoyed imperial preference since he supported it with generous privileges. Constantine established the principle that emperors could not settle questions of doctrine on their own but should instead summon general ecclesiastical councils for that purpose. His convening of both the Synod of Arles and the First Council of Nicaea indicated his interest in the unity of the Church and showcased his claim to be its head.; ; . The rise of Christianity was briefly interrupted on the accession of the emperor Julian in 361, who made a determined effort to restore polytheism throughout the empire and was thus dubbed "Julian the Apostate" by the Church. However, this was reversed when Julian was killed in battle in 363.

Theodosius I (379–395) was the last emperor to rule both the Eastern and Western halves of the empire. In 391 and 392 he issued a series of edicts essentially banning pagan religion. Pagan festivals and sacrifices were banned, as was access to all pagan temples and places of worship. The last Olympic Games are believed to have been held in 393. In 395, Theodosius I bequeathed the imperial office jointly to his sons: Arcadius in the East and Honorius in the West, once again dividing imperial administration. In the 5th century, the Eastern part of the empire was largely spared the difficulties faced by the West—due in part to a more established urban culture and greater financial resources, which allowed it to placate invaders with tribute and pay foreign mercenaries. This success allowed Theodosius II to focus on codifying Roman law with the '' Codex Theodosianus'' and further fortification of the walls of Constantinople, which left the city impervious to most attacks until 1204.

To fend off the Huns, Theodosius had to pay an enormous annual tribute to Attila. His successor, Marcian, refused to continue to pay the tribute, but Attila had already diverted his attention to the Western Roman Empire. After Attila's death in 453, the Hun Empire collapsed, and many of the remaining Huns were often hired as mercenaries by Constantinople.

Loss of the Western Roman Empire

After the fall of Attila, the Eastern Empire enjoyed a period of peace, while the Western Empire continued to deteriorate with the expanding migration and invasions of the barbarians, most prominently the Germanic nations. The West's end is usually dated 476 when the East Germanic Roman '' foederati'' general Odoacer deposed the Western Emperor Romulus Augustulus, a year after the latter usurped the position from Julius Nepos. In 480 with the death of Nepos, Eastern Emperor Zeno became sole claimant to emperor of the empire. Odoacer became King of Italy and was nominally Zeno's subordinate but acted with complete autonomy, eventually providing support to a rebellion against the emperor.

Zeno negotiated with the invading Ostrogoths, who had settled in Moesia, convincing the Gothic king Theodoric to depart for Italy as ''magister militum per Italiam'' ("commander in chief for Italy") to depose Odoacer. By urging Theodoric to conquer Italy, Zeno rid the Eastern Empire of an unruly subordinate (Odoacer) and moved another (Theodoric) further from the heart of the empire. After Odoacer's defeat in 493, Theodoric ruled Italy ''de facto'', although he was never recognised by the eastern emperors as "king" (''rex'').

In 491, Anastasius I, an aged civil officer of Roman origin, became emperor, but it was not until 497 that the forces of Anastasius effectively took the measure of Isaurian resistance. Anastasius revealed himself as an energetic reformer and an able administrator. He introduced a new coinage system of the copper ''follis'', the coin used in most everyday transactions. He also reformed the tax system and permanently abolished the chrysargyron tax. The state treasury contained the enormous sum of of gold when Anastasius died in 518 (roughly worth US$8.3 billion today).

Justinian dynasty

The rise of Justinian I

The Justinian dynasty was founded by Justin I, who though illiterate, rose through the ranks of the Byzantine army to become emperor in 518. He was succeeded by his nephew Justinian I in 527, who may already have exerted effective control during Justin's reign.. One of the most important figures of late antiquity and possibly the last Roman emperor to speak Latin as a first language, Justinian's rule constitutes a distinct epoch, marked by the ambitious but only partly realised ''renovatio imperii'', or "restoration of the empire". Justinian's wife Theodora was particularly influential.

In 529, Justinian appointed a ten-man commission chaired by John the Cappadocian to revise Roman law and create a new codification of laws and jurists' extracts, known as the "''Corpus Juris Civilis''", or the Justinian Code. In 534, the ''Corpus'' was updated and, along with the enactments promulgated by Justinian after 534, formed the system of law used for most of the rest of the Byzantine era. The ''Corpus'' forms the basis of civil law of many modern states.

Renovatio imperii and the wars of Justinian

In 532, attempting to secure his eastern frontier, Justinian signed a peace treaty with Khosrau I of Persia, agreeing to pay a large annual tribute to the Sassanids. In the same year, he survived a revolt in Constantinople (the Nika riots), which solidified his power but ended with the deaths of a reported 30,000 to 35,000 rioters on his orders. The western conquests began in 533, as Justinian sent his general Belisarius to reclaim the former province of Africa from the Vandals, who had been in control since 429 with their capital at Carthage. Success in the war came with surprising ease, but it was not until 548 that the major local tribes were subdued..

In 535, a small Byzantine expedition to Sicily met with easy success, but the Goths stiffened their resistance, and victory did not come until 540 when Belisarius captured Ravenna, after successful sieges of Naples and Rome.; . In 535–536, Ostrogoth King Theodahad sent Pope Agapetus I to Constantinople to request the removal of Byzantine forces from Sicily, Dalmatia, and Italy. Although Agapetus failed in his mission to sign a peace with Justinian, he succeeded in having the monophysite Patriarch Anthimus I denounced at the Council of Constantinople, despite Empress Theodora's support and protection.; .

The Ostrogoths captured Rome in 546. Belisarius, who had been sent back to Italy in 544, was eventually recalled to Constantinople in 549.; . The arrival of the Armenian eunuch Narses in Italy (late 551) with an army of 35,000 men marked another shift in Gothic fortunes. Ostrogoth King Totila was defeated at the Battle of Taginae, and his successor Teia was defeated at the Battle of Mons Lactarius in October 552. Despite continuing resistance from a few Gothic garrisons and two subsequent invasions by the Franks and Alemanni, the war for the Italian peninsula was at an end.; . In 551, Athanagild, a noble from Visigothic Hispania, sought Justinian's help in a rebellion against the king, and the emperor dispatched a force under Liberius, a successful military commander. The empire held on to a small slice of the Iberian Peninsula coast until the reign of Heraclius.; .

In the east, the Roman–Persian Wars continued until 561 when the envoys of Justinian and Khosrau agreed on a 50-year peace. By the mid-550s, Justinian had won victories in most theatres of operation, with the notable exception of the Balkans, which were subjected to repeated incursions from the Slavs and the Gepids. Tribes of Serbs and Croats were later resettled in the northwestern Balkans, during the reign of Heraclius. Justinian called Belisarius out of retirement and defeated the new Hunnish threat. The strengthening of the Danube fleet caused the Kutrigur Huns to withdraw, and they agreed to a treaty that allowed safe passage back across the Danube.

Transition into an eastern Christian empire

Although polytheism had been suppressed by the state since at least the time of Theodosius I in the 4th century, traditional Greco-Roman culture was still influential in the Eastern empire in the 6th century. Hellenistic philosophy began to be gradually amalgamated into newer Christian philosophy. Philosophers such as John Philoponus drew on neoplatonic ideas in addition to Christian thought and empiricism. Because of the active paganism of its professors, Justinian closed down the Neoplatonic Academy in 529. Other schools continued in Constantinople, Antioch and Alexandria, which were the centres of Justinian's empire. Hymns written by Romanos the Melodist marked the development of the Divine Liturgy, while the architects Isidore of Miletus and Anthemius of Tralles worked to complete the Church of the Holy Wisdom, Hagia Sophia, which was designed to replace an older church destroyed during the Nika Revolt. Completed in 537, the Hagia Sophia stands today as one of the major monuments of Byzantine architectural history. During the 6th and 7th centuries, the empire was struck by a series of epidemics, which devastated the population and contributed to a significant economic decline and a weakening of the empire. Great bathhouses were built in Byzantine centres such as Constantinople and Antioch.

Decline of the Justinian dynasty

After Justinian died in 565, his successor, Justin II, refused to pay the large tribute to the Persians. Meanwhile, the Germanic Lombards invaded Italy; by the end of the century, only a third of Italy was in Byzantine hands. Justin II's successor, Tiberius II, choosing between his enemies, awarded subsidies to the Avars while taking military action against the Persians. Although Tiberius' general, Maurice, led an effective campaign on the eastern frontier, subsidies failed to restrain the Avars, who captured the Balkan fortress of Sirmium in 582, while the Slavs began to make inroads across the Danube.; ; .

Maurice succeeded Tiberius and intervened in a Persian civil war, placing the legitimate Khosrau II back on the throne, and married his daughter to him. Maurice's treaty with his son-in-law enlarged the territories of the empire to the East and allowed the energetic emperor to focus on the Balkans. By 602, a series of successful Byzantine campaigns had pushed the Avars and Slavs back across the Danube. However, Maurice's refusal to ransom several thousand captives taken by the Avars, and his order to the troops to winter in the Danube, caused his popularity to plummet. A revolt broke out under an officer named Phocas, who marched the troops back to Constantinople; Maurice and his family were murdered while trying to escape.

Arab invasions and shrinking borders

Early Heraclian dynasty

After Maurice's murder by Phocas, Khosrau used the pretext to reconquer the Roman province of Mesopotamia. Phocas, an unpopular ruler invariably described in Byzantine sources as a "tyrant", was the target of a number of Senate-led plots. He was eventually deposed in 610 by Heraclius, who sailed to Constantinople from Carthage with an icon affixed to the prow of his ship.

Following the accession of Heraclius, the Sassanid advance pushed deep into the Levant, occupying Damascus and Jerusalem and removing the True Cross to Ctesiphon. The counter-attack launched by Heraclius took on the character of a holy war, and an acheiropoieton image of Christ was carried as a military standard (similarly, when Constantinople was saved from a combined Avar–Sassanid–Slavic siege in 626, the victory was attributed to the icons of the Virgin that were led in procession by Patriarch Sergius about the walls of the city). The combined forces unsuccessfully besieged the capital between June and July. After this, the Sassanid army was forced to withdraw to Anatolia. The loss came just after news had reached them of yet another Byzantine victory, where Heraclius's brother Theodore heavily defeated the Persian general Shahin. Following this, Heraclius led an invasion into Sassanid Mesopotamia once again.

The main Sassanid force was destroyed at Nineveh in 627, and in 629 Heraclius restored the True Cross to Jerusalem in a majestic ceremony, as he marched into the Sassanid capital of Ctesiphon, where anarchy and civil war reigned as a result of the enduring war. Eventually, the Persians were obliged to withdraw all armed forces and return Sassanid-ruled Egypt, the Levant and whatever imperial territories of Mesopotamia and Armenia were in Roman hands at the time of an earlier peace treaty in . The war had exhausted both the Byzantines and Sassanids, however, and left them extremely vulnerable to the Muslim forces that emerged in the following years. The Byzantines suffered a crushing defeat by the Arabs at the Battle of Yarmouk in 636, while Ctesiphon fell to the Rashidun Caliphate in 637.

First Arab siege of Constantinople (674–678) and the theme system

The Arabs, firmly in control of Syria and the Levant, sent frequent raiding parties deep into Asia Minor, and in 674–678 laid siege to Constantinople. The Arab fleet was finally repulsed through the use of Greek fire, and a thirty-years' truce was signed between the empire and the Umayyad Caliphate. However, the Anatolian raids continued unabated and accelerated the demise of classical urban culture, with the inhabitants of many cities either refortifying much smaller areas within the old city walls or relocating entirely to nearby fortresses. Constantinople shrank substantially from 500,000 inhabitants to just 40,000–70,000, and, like other urban centres, it was partly ruralised. The city also lost the free grain shipments in 618, after Egypt fell first to the Persians and then to the Arabs, and public wheat distribution ceased.

The void left by the disappearance of the old semi-autonomous civic institutions was filled by the system called ''theme'', which entailed dividing Asia Minor into "provinces" occupied by distinct armies that assumed civil authority and answered directly to the imperial administration. This system may have had its roots in certain ''ad hoc'' measures taken by Heraclius, but over the course of the 7th century it developed into an entirely new system of imperial governance. The massive cultural and institutional restructuring of the empire consequent on the loss of territory in the 7th century has been said to have caused a decisive break in east Mediterranean ''Romanness'', and that the Byzantine state is subsequently best understood as another successor state rather than a real continuation of the Roman Empire.

Late Heraclian dynasty

The withdrawal of large numbers of troops from the Balkans to combat the Persians and then the Arabs in the east opened the door for the gradual southward expansion of Slavic peoples into the peninsula, and, as in Asia Minor, many cities shrank to small fortified settlements. In the 670s, the Bulgars were pushed south of the Danube by the arrival of the Khazars. In 680, Byzantine forces sent to disperse these new settlements were defeated..

In 681, Constantine IV signed a treaty with the Bulgar Khan Asparukh, and the new Bulgarian state assumed sovereignty over several Slavic tribes that had previously, at least in name, recognised Byzantine rule. In 687–688, the final Heraclian emperor, Justinian II, led an expedition against the Slavs and Bulgarians and made significant gains, although the fact that he had to fight his way from Thrace to Macedonia demonstrates the degree to which Byzantine power in the north Balkans had declined.

Justinian II attempted to break the power of the urban aristocracy through severe taxation and the appointment of "outsiders" to administrative posts. He was driven from power in 695 and took shelter first with the Khazars and then with the Bulgarians. In 705, he returned to Constantinople with the armies of the Bulgarian Khan Tervel, retook the throne and instituted a reign of terror against his enemies. With his final overthrow in 711, supported once more by the urban aristocracy, the Heraclian dynasty came to an end.

Second Arab siege of Constantinople (717–718) and the Isaurian dynasty

In 717 the Umayyad Caliphate launched a siege on Constantinople which lasted for one year. However, the combination of Leo III the Isaurian's military genius, the Byzantines' use of Greek fire, a cold winter in 717–718, and Byzantine diplomacy with the Khan Tervel of Bulgaria resulted in a Byzantine victory. After Leo III turned back the Muslim assault in 718, he addressed himself to the task of reorganising and consolidating the ''themes'' in Asia Minor. In 740 a major Byzantine victory took place at the Battle of Akroinon where the Byzantines destroyed the Umayyad army.

Constantine V won noteworthy victories in northern Syria and also thoroughly undermined Bulgarian strength. In 746, profiting by the unstable conditions in the Umayyad Caliphate, which was falling apart under Marwan II, Constantine V invaded Syria and captured Germanikeia, and the Battle of Keramaia resulted in a major Byzantine naval victory over the Umayyad fleet. Coupled with military defeats on other fronts of the caliphate and internal instability, Umayyad expansion came to an end.

Religious dispute over iconoclasm

The 8th and early 9th centuries were also dominated by controversy and religious division over Iconoclasm, which was the main political issue in the empire for over a century. Icons (here meaning all forms of religious imagery) were banned by Leo and Constantine from around 730, leading to revolts by iconodules (supporters of icons) throughout the empire. After the efforts of Empress Irene, the Second Council of Nicaea met in 787 and affirmed that icons could be venerated but not worshipped. Irene is said to have endeavoured to negotiate a marriage between herself and Charlemagne, but according to Theophanes the Confessor the scheme was frustrated by Aetios, one of her advisors.; .

In the early 9th century, Leo V reintroduced the policy of iconoclasm, but in 843 Empress Theodora restored the veneration of icons with the help of Patriarch Methodios.. Iconoclasm played a part in the further alienation of East from West, which worsened during the so-called Photian schism when Pope Nicholas I challenged the elevation of Photios to the patriarchate.

Macedonian dynasty and resurgence (867–1025)

The accession of Basil I to the throne in 867 marks the beginning of the Macedonian dynasty, which ruled for 150 years. This dynasty included some of the ablest emperors in Byzantium's history, and the period is one of revival. The empire moved from defending against external enemies to reconquest of territories.. The Macedonian dynasty was characterised by a cultural revival in spheres such as philosophy and the arts. There was a conscious effort to restore the brilliance of the period before the Slavic and subsequent Arab invasions, and the Macedonian era has been dubbed the "Golden Age" of Byzantium. Although the empire was significantly smaller than during the reign of Justinian I, it had regained much strength, as the remaining territories were less geographically dispersed and more politically, economically, and culturally integrated.

Wars against the Abbasids

Taking advantage of the empire's weakness after the Revolt of Thomas the Slav in the early 820s, the Arabs re-emerged and captured Crete. They also successfully attacked Sicily, but in 863 general Petronas gained a decisive victory at the Battle of Lalakaon against Umar al-Aqta, the emir of Melitene (Malatya). Under the leadership of Emperor Krum, the Bulgarian threat also re-emerged, but in 815–816 Krum's son, Omurtag, signed a peace treaty with Leo V.

In the 830s the Abbasid Caliphate started military excursions culminating with a victory in the Sack of Amorium. The Byzantines then counter-attacked and sacked Damietta in Egypt. Later the Abbasid Caliphate responded by sending their troops into Anatolia again, sacking and marauding until they were eventually annihilated by the Byzantines at the Battle of Lalakaon in 863.

In the early years of Basil I's reign, Arab raids on the coasts of Dalmatia and the siege of Ragusa (866–868) were defeated, and the region once again came under secure Byzantine control. This enabled Byzantine missionaries to penetrate to the interior and convert the Serbs and the principalities of modern-day Herzegovina and Montenegro to Christianity..

By contrast, the Byzantine position in Southern Italy was gradually consolidated; by 873 Bari was once again under Byzantine rule, and most of Southern Italy remained in the empire for the next 200 years. On the more important eastern front, the empire rebuilt its defences and went on the offensive. The Paulicians were defeated at the Battle of Bathys Ryax and their capital of Tephrike ( Divrigi) taken, while the offensive against the Abbasid Caliphate began with the recapture of Samosata

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