The monarchs of Bulgaria ruled the country during three periods of

Bulgaria Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedo ...

's history as an independent country: from the establishment of the

First Bulgarian Empire The First Bulgarian Empire ( cu, блъгарьско цѣсарьствиѥ, blagarysko tsesarystviye; bg, Първо българско царство) was a medieval Bulgar- Slavic and later Bulgarian state that existed in Southeastern Eur ...

in 681 to the Byzantine conquest of Bulgaria in 1018; from the Uprising of Asen and Peter that established the

Second Bulgarian Empire The Second Bulgarian Empire (; ) was a medieval Bulgarian state that existed between 1185 and 1396. A successor to the First Bulgarian Empire, it reached the peak of its power under Tsars Kaloyan and Ivan Asen II before gradually being conque ...

in 1185 to the annexation of the rump Bulgarian state into the Ottoman Empire in 1396; and from the re-establishment of an independent

Principality of Bulgaria The Principality of Bulgaria ( bg, Княжество България, Knyazhestvo Balgariya) was a vassal state under the suzerainty of the Ottoman Empire. It was established by the Treaty of Berlin in 1878. After the Russo-Turkish War end ...

in 1878 to the abolition of

monarchy A monarchy is a form of government in which a person, the monarch, is head of state for life or until abdication. The political legitimacy and authority of the monarch may vary from restricted and largely symbolic ( constitutional monar ...

in a

referendum A referendum (plural: referendums or less commonly referenda) is a Direct democracy, direct vote by the Constituency, electorate on a proposal, law, or political issue. This is in contrast to an issue being voted on by a Representative democr ...

held on 15 September 1946. This list does not include the mythical Bulgar rulers and the rulers of

Old Great Bulgaria Old Great Bulgaria or Great Bulgaria (Medieval Greek: Παλαιά Μεγάλη Βουλγαρία, ''Palaiá Megálē Voulgaría''), also often known by the Latin names ''Magna Bulgaria'' and ''Patria Onoguria'' (" Onogur land"), was a 7th- ...

listed in the Nominalia of the Bulgarian rulers, as well as unsuccessful claimants to the throne who are not generally listed among the Bulgarian monarchs, neither rulers of

Volga Bulgaria Volga Bulgaria or Volga–Kama Bulgaria, was a historic Bulgar state that existed between the 7th and 13th centuries around the confluence of the Volga and Kama River, in what is now European Russia. Volga Bulgaria was a multi-ethnic state ...

, or other famous Bulgarian rulers as Kuber or Alcek. Early Bulgarian rulers possibly used the title '' Kanasubigi'' (possibly related to

Knyaz , or ( Old Church Slavonic: Кнѧзь) is a historical Slavic title, used both as a royal and noble title in different times of history and different ancient Slavic lands. It is usually translated into English as prince or duke, dependi ...

Khan Khan may refer to: *Khan (inn), from Persian, a caravanserai or resting-place for a travelling caravan *Khan (surname), including a list of people with the name *Khan (title), a royal title for a ruler in Mongol and Turkic languages and used by ...

) before the 7th century and until the 9th century, possibly read as ''Kanas U Bigi'' or ''Kanas Ubigi'', was a title of the early rulers. The title ''khan'' for early Bulgar rulers is an assumed one, as only the form ''kanasubigi'' or "kanasybigi" is attested in stone inscriptions. Among the proposed translations for the phrase ''kanasubigi'' is, more recently, "(ruler) from God", from the

Indo-European The Indo-European languages are a language family native to the overwhelming majority of Europe, the Iranian plateau, and the northern Indian subcontinent. Some European languages of this family, English, French, Portuguese, Russian, Du ...

''*su-'' and ''baga-'', i.e. ''*su-baga'' (an equivalent of the

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

phrase , ''ho ek Theou archon'', which is common in Bulgar inscriptions). This titulature presumably persisted until the Bulgars adopted

Christianity Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth. It is the world's largest and most widespread religion with roughly 2.38 billion followers representing one-third of the global popula ...

. Some Bulgar inscriptions written in Greek and later in Slavonic refer to the Bulgarian ruler respectively with the Greek title ''archon'' or the Slavic title ''

''. The title Knyaz (Prince) was used for a brief period by

Boris I of Bulgaria Boris I, also known as Boris-Mihail (Michael) and ''Bogoris'' ( cu, Борисъ А҃ / Борисъ-Михаилъ bg, Борис I / Борис-Михаил; died 2 May 907), was the ruler of the First Bulgarian Empire in 852–889. A ...

(and his two successors) after the Christianization of Bulgaria in 864. In Nominalia of the Bulgarian rulers the title Knyaz was also used. The title ''

tsar Tsar ( or ), also spelled ''czar'', ''tzar'', or ''csar'', is a title used by East and South Slavic monarchs. The term is derived from the Latin word ''caesar'', which was intended to mean "emperor" in the European medieval sense of the ter ...

'', the Bulgarian form of the

Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...

Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, an ...

'', was first adopted and used in

by Simeon I the Great (son of Knyaz Boris I), following a decisive victory over the

Byzantine Empire 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 Constantinopl ...

in 913. It was also used by all of Simeon I's successors until the fall of Bulgaria under Ottoman rule in 1396. After Bulgaria's liberation from the Ottomans in 1878, its first monarch

Alexander I Alexander I may refer to: * Alexander I of Macedon, king of Macedon 495–454 BC * Alexander I of Epirus (370–331 BC), king of Epirus * Pope Alexander I (died 115), early bishop of Rome * Pope Alexander I of Alexandria (died 320s), patriarch of A ...

adopted the title ''knyaz'', or prince. However, when de jure independence was proclaimed under his successor

Ferdinand Ferdinand is a Germanic name composed of the elements "protection", "peace" (PIE "to love, to make peace") or alternatively "journey, travel", Proto-Germanic , abstract noun from root "to fare, travel" (PIE , "to lead, pass over"), and "co ...

in 1908, the title was elevated to the customary ''tsar'' once more. However, while the title ''tsar'' was translated as "

emperor 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 ( ...

" in the cases of the First and Second Bulgarian Empires, Ferdinand's title was translated as "

king King is the title given to a male monarch in a variety of contexts. The female equivalent is queen regnant, queen, which title is also given to the queen consort, consort of a king. *In the context of prehistory, antiquity and contempora ...

." The use of ''tsar'' continued under Ferdinand and later under his heirs Boris III and Simeon II until the abolition of monarchy in 1946. In the few surviving medieval Bulgarian royal charters, the monarchs of Bulgaria styled themselves as "In Christ the Lord Faithful Emperor and Autocrat of all Bulgarians" or similar variations, sometimes including “... and Romans, Greeks, or

Vlachs "Vlach" ( or ), also "Wallachian" (and many other variants), is a historical term and exonym used from the Middle Ages until the Modern Era to designate mainly Romanians but also Aromanians, Megleno-Romanians, Istro-Romanians and other Easte ...

". The early Bulgarian ruler Kubrat (632-665), as important allied foreign ruler, was granted the title of ''

Patrikios The patricians (from la, patricius, Greek: πατρίκιος) were originally a group of ruling class families in ancient Rome. The distinction was highly significant in the Roman Kingdom, and the early Republic, but its relevance waned aft ...

'' (Patrician) by the Eastern Roman Emperor. His ring A was inscribed in Greek XOBPATOY and ring C was inscribed XOBPATOY ПATPIKIOY, indicating the dignity of ''Patrikios'' (Patrician) that he had achieved in the Byzantine world. In 705 the Eastern Roman Emperor

Justinian II Justinian II ( la, Iustinianus; gr, Ἰουστινιανός, Ioustinianós; 668/69 – 4 November 711), nicknamed "the Slit-Nosed" ( la, Rhinotmetus; gr, ὁ Ῥινότμητος, ho Rhinótmētos), was the last Eastern Roman emperor of the ...

gave the title

caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, an ...

to the Bulgarian ruler

Tervel Khan Tervel ( bg, Тервел) also called ''Tarvel'', or ''Terval'', or ''Terbelis'' in some Byzantine sources, was the khan of Bulgaria during the First Bulgarian Empire at the beginning of the 8th century. In 705 Emperor Justinian II named ...

, the first foreigner to receive this title.Андреев, Й. Българските ханове и царе (VII-XIV в.). София, 1987Хан Тервел - тема за кандидат студенти
The

Pope Innocent III Pope Innocent III ( la, Innocentius III; 1160 or 1161 – 16 July 1216), born Lotario dei Conti di Segni (anglicized as Lothar of Segni), was the head of the Catholic Church and ruler of the Papal States from 8 January 1198 to his death in 16 ...

dispatched Cardinal Leo Brancaleoni to Bulgaria in early 1204 to crown Kaloyan with the title of

King King is the title given to a male monarch in a variety of contexts. The female equivalent is queen regnant, queen, which title is also given to the queen consort, consort of a king. *In the context of prehistory, antiquity and contempora ...

of the Bulgarians and Vlachs.