List of Bulgarian monarchs

The monarchs of Bulgaria ruled Bulgaria during the medieval First (c. 680–1018) and Second (1185–1422) Bulgarian empires, as well as during the modern Principality (1879–1908) and Kingdom (1908–1946) of Bulgaria. This list includes monarchs from the establishment of the First Bulgarian Empire until modern times, omitting earlier mythical rulers as well as rulers of separate states such as Old Great Bulgaria and Volga Bulgaria.

Various titles have been used by the rulers of Bulgaria. The earliest recorded title, used before Bulgaria's conversion to Christianity, is kanasubigi, which is an earlier form of the title knyaz. When Bulgaria converted to Christianity in the ninth century, the ruler Boris I (852–889) was using the title knyaz (prince). For much of its later history under the first and second empires, Bulgaria functioned as a multi-ethnic imperial state modelled on the neighbouring Byzantine Empire, which contributed to the adoption of the title of tsar (emperor) by Bulgarian monarchs beginning with Simeon I (893–927) in 913. Some powerful medieval Bulgarian rulers challenged Byzantine authority by proclaiming themselves as both Bulgarian and Roman emperors.

When Bulgaria re-emerged as a state in 1878 in the form of the Principality of Bulgaria, the rulers initially used the title knyaz since they were autonomous vassals of the Ottoman Empire and not fully independent. From Bulgaria's complete independence from the Ottomans in 1908 until the abolition of the monarchy in 1946, Bulgarian monarchs once more used the title tsar, though this time generally translated internationally as "king" rather than "emperor".

Titles in the First Bulgarian Empire (681–1018)
Evidence concerning the titles used by the rulers of the First Bulgarian Empire (681–1018) prior to the conversion to Christianity in the 860s is scant. The only title known from contemporary sources is kanasubigi, recorded in ten Greek-language inscriptions (as ΚΑΝΑΣΥΒΙΓΙ) from the ninth century in reference to Omurtag (814–831) and his son Malamir (831–836). Two gold medallions struck for Omurtag also use the same title.

Upon his conversion to Christianity in 864/865, Boris I (852–889) adopted the new ruling title knyaz, generally translated as "prince" (though sometimes alternatively as "king"). This title was used by the Bulgarian rulers until 913, when the knyaz Simeon I (893–927), Boris I's son, invaded the Byzantine Empire. Simeon aspired to make Bulgaria into the new "universal monarchy" (a role the Byzantines viewed themselves as having) by absorbing and replacing the empire centered in Constantinople. Due to the threat presented by Simeon, who reached the walls of Constantinople, the Byzantines relented and the Patriarch of Constantinople, Nicholas Mystikos, granted him an imperial crown. The only other monarch recognized as a basileus (i.e. emperor) by the Byzantines was (at times) the Holy Roman emperor. The Byzantines did not consider Simeon as outranking their own emperors and designated him as the "Emperor of the Bulgarians". Simeon himself used the grander title "Emperor of the Bulgarians and the Romans". The title of emperor was in Bulgarian translated as tsar (deriving from the Latin caesar), seen as equivalent to the Greek basileus or Latin imperator.

Bulgarian rulers from the death of Simeon I in 927 until the fall of the First Bulgarian Empire in 1018 used the simpler "Emperor of the Bulgarians", ceasing to claim Byzantium's universal monarchy.

Titles in the Second Bulgarian Empire (1185–1422)
The first rulers of the Second Bulgarian Empire (1185–1422) revived the style used by Simeon I's successors, "Emperor of the Bulgarians", rendered tsr’ Bl’garom in Bulgarian documents and imperator Bulgarorum in Latin. The second empire's third ruler, Kaloyan (1196–1207), adopted the grander title "Emperor of Bulgarians and Vlachs" (imperator Bulgarorum et Blachorum). He unsuccessfully sought recognition of this title from the Papacy, though Pope Innocent III merely recognized him as "King of the Bulgarians and Vlachs" (rex Bulgarorum et Blachorum), not wishing to recognize any other emperor than the Holy Roman emperor.

The fifth ruler of the second empire, Ivan Asen II (1218–1241) after 1230 extended his original title "Emperor of the Bulgarians" to the grander "Emperor of the Bulgarians and Greeks" (tsr’ Bl’garom i Gr’kom, Latin: imperator Bulgarorum et Grecorum). This title was taken to reflect his extensive conquests in formerly Byzantine territory and was effectively a revival of Simeon I's title since both "Greeks" and "Romans" were envisioned as referring to the inhabitants of the Byzantine Empire. Ivan Asen II also introduced the element "autocrat" (Bulgarian: samodrzac, Latin: moderator) into the Bulgarian imperial title, modelled on its usage in the Byzantine imperial title, and eventually in full styled himself as the "Emperor and Autocrat of the Bulgarians and Greeks" (Bulgarian: tsr’ i samodrzac Bl’garom i Gr’kom, Latin: imperator et moderator Bulgarorum et Grecorum).

Ivan Asen II's successors kept "autocrat" in the title but returned to the simpler style "Emperor and Autocrat of the Bulgarians". His extended title was later revived by Ivan Alexander (1331–1371), who also proclaimed himself as the "Emperor and Autocrat of the Bulgarians and Greeks" to challenge the authority of the then weakened Byzantine Empire. Ivan Alexander's son Ivan Shishman (1371–1395) is also recorded to have used this extended imperial title.

Titles in modern Bulgaria (1878–1946)
The Tarnovo Constitution of the modern Principality of Bulgaria (1878–1908) stipulated that the monarch was to use the title "Knyaz of Bulgaria" (i.e. "Prince of Bulgaria") rather than tsar due to the principality being an autonomous vassal state of the Ottoman Empire rather than a fully independent country.

When Bulgaria achieved complete independence from the Ottoman Empire in 1908, the former knyaz Ferdinand I (1887–1918) adopted the higher title of "Tsar of the Bulgarians", as had been used by Bulgarian monarchs in the Middle Ages. The assumption of the title of tsar was met with opposition from both the Ottomans and the Russian Empire. Although tsar had been understood as equivalent to emperor in medieval times, the title of the new Bulgarian tsars was generally translated as "King of the Bulgarians" internationally.

Names and regnal numbers
Regnal numbers for monarchs have only been officially used in Bulgaria in modern times, beginning with Alexander I in 1879. Modern historiography retroactively also assigns sequential regnal numbers to medieval Bulgarian rulers, even if they ruled different Bulgarian states and used different titles; Boris I (852–889) ruled the First Bulgarian Empire as a prince (knyaz), his great-grandson Boris II (967–977) ruled the same state as emperor, and Boris III (1918–1943) ruled the modern Kingdom of Bulgaria as tsar (king).

There were three different types of names used by medieval Bulgarian monarchs after Bulgaria converted to Christianity; names drawn from Bulgar or Slavic tradition (i.e. Boris, Boril, Vladimir, Presian), names drawn from Christian tradition (i.e. Michael, Simeon, Peter, Ivan, Samuel), or double names combining both (i.e. Ivan Vladislav, Gavril Radomir, Ivan Sratsimir, Theodore Svetoslav). When using a double name, the Christian name always preceded the name drawn from local tradition. Very rarely, Bulgarian rulers used double names combining two Christian names (i.e. Ivan Stephen, Ivan Alexander).

The use of double names by Bulgarian monarchs, sometimes not used consistently in contemporary sources, has in cases led to confusion and misunderstanding in modern efforts to assign regnal numbers. In particular, it has sometimes erroneously been assumed that the usage of double names indicated that the monarchs employed family names; this interpretation has in the past resulted in the use of names such as Ivan II Asen (for Ivan Asen II), George I Terter (for George Terter I) and Michael III Shishman (for Michael Asen III). Names of clans were prominently used in Bulgaria in pre-Christian times, though disappeared from usage sometime after the conversion to Christianity, despite family names being used in some of Bulgaria's closest neighbours (such as the Byzantine Empire). Although names such as Asen or Terter could serve as genealogical and political markers to demonstrate a ruler's position in an illustrious lineage they were also fully part of the ruler's regnal names, as demonstrated by those rulers whose double names excluded genealogical connections (such as Ivan Alexander). Double names with genealogical connotations were at times also claimed by rulers not belonging to the same dynastic lineage, such as Mitso Asen (1256–1257; who married into the Asen dynasty).

Early Bulgarian rulers (c. 680–803)
The First Bulgarian Empire is regarded to have been established c. 680 when the Bulgarian ruler Asparuh crossed the Danube. Asparuh's family, the Dulo clan, claimed descent from the Hunnic ruler Attila, through Attila's son Ernak. References to political developments within Bulgaria prior to the reign of Krum (c. 803–814) are extremely scant, making the dates and family relationships of the rulers recorded in contemporary and later sources highly uncertain. The rulers below may all belong to the Dulo clan or might alternatively have belonged to various competing clans. Several alternate chronologies of early Bulgarian rulers have been proposed, with some presented below, with the names standardized across sources:

Pretenders during Byzantine rule (1018–1185)
Various Byzantine military governors (with the title strategos) were appointed in formerly Bulgarian lands over the course of the Byzantine conquest of Bulgaria, from the 970s onwards. Following the completion of the conquest of Bulgaria in 1018, Emperor Basil II organized much of the central Balkans into the Theme of Bulgaria, which was governed by an imperially appointed official titled (depending on the time) as the doux (duke) or katepano of Bulgaria. The capital of Byzantine Bulgaria was Skopion (modern-day Skopje). There were several attempts at restoring the Bulgarian Empire during the nearly two centuries of Byzantine rule.

Successors of the Asenids (1256–1280)
The end of the male line of the House of Asen plunged Bulgaria into a chaotic period of fragmentation and civil wars between numerous lines of claimants.

House of Sratsimir (1331–1422)
The rulers of the House of Sratsimir, patrilineal descendants of the despot Sratsimir, are in lists of monarchs often designated as part of the Shishmanid dynasty, with which they only share matrilineal descent. Through their matrilineal descent from the House of Shishman, the rulers of the House of Sratsimir were also descendants of the House of Asen.

Pretenders during Ottoman rule (1422–1878)
Following the gradual conquest of Bulgaria in the 14th and 15th centuries, the Ottomans incorporated the Bulgarian lands into the vast province of Rumelia. In the late 16th century, the new province of Silistra was created due to persistent northern attacks from the Cossacks. Later on, much of modern-day northern Bulgaria was organized into the Danube vilayet, which in terms of borders closely corresponded to the succeeding autonomous Principality of Bulgaria. Like under the period of Byzantine rule, the Ottoman authorities were sometimes faced with Bulgarian uprisings aimed at independence, at times also involving the proclamation of new Bulgarian monarchs.