Khazar Khaganate

The earliest Khazar figure documented by name in Byzantine sources; commanded Khazar forces allied with Emperor Heraclius against Sassanid Persia in 627–628; his alliance with Byzantium established the Khazar–Byzantine relationship that defined Caucasian geopolitics for two centuries

Byzantine sources record him as a Khazar Qaghan who arranged a marriage alliance with the Byzantine imperial family; documented in the chronicle of Theophanes the Confessor as a significant diplomatic partner of Constantinople

Ruled during the critical Arab–Khazar wars; his forces halted the Umayyad Caliphate's northern expansion at the Battle of Ardabil in 730, one of the most strategically consequential battles of the early medieval period; Arab commander Jarrah ibn Abdallah was killed in this engagement

Son of Bihar; led the major Khazar counter-offensive into the Caucasus and into Azerbaijan in 730–731; initially successful but ultimately defeated by Marwan ibn Muhammad's massive Umayyad campaign of 737 which penetrated deep into the steppe — the furthest Arab armies ever reached northward

The Qaghan credited in the Khazar Correspondence with the initial conversion to Judaism; according to the account preserved by King Joseph, Bulan rejected both Islam and Christianity in favor of Judaism after hosting a religious debate among representatives of all three faiths; his conversion began as a private royal adoption rather than an immediate state religion

The Qaghan who transformed the private royal conversion of Bulan into a formal state religion; built synagogues and Jewish schools throughout the khaganate; invited rabbinical scholars from Babylonia and the Byzantine lands; established the Mishnah and Talmud as the basis for Jewish practice in the khaganate — the most significant institutionalization of Judaism by any medieval state

Son of Obadiah; continued his father's policy of Jewish patronage; his brief reign maintained the religious reforms at court

Nephew of Obadiah; ruled during a period of internal tension — members of the Khazar aristocracy who had not converted to Judaism reportedly staged a revolt against the Judaizing dynasty, which was suppressed

Briefly held the Qaghan title during the post-revolt stabilization period; his Hebrew name reflects the deep integration of Jewish naming conventions into the Khazar royal house by this generation

Oversaw the consolidation of Khazar power on the Volga trade route; his reign saw the expansion of commerce with the Islamic world, the Rus', and the Byzantine Empire, making the Khazar capital Itil a major Silk Road entrepôt

Ruled during the period of initial Rus' expansion; the Rus' Varangian traders and raiders who appeared on the Volga during his reign would become the khaganate's most significant long-term challenge

His reign saw the height of Khazar commercial prosperity; the Volga trade route connecting the Baltic with the Islamic world generated enormous wealth, and Itil became one of the great cities of the early medieval world

Ruled during the period of increasing Rus' activity on the Volga; Byzantine sources document intensifying diplomatic contact between Constantinople and the Khazar court during this period

Maintained the dual-ruler system with increasing difficulty; the executive Bek rather than the sacred Qaghan held actual military command — a governance model that limited the Qaghan's ability to respond decisively to external threats

His reign coincided with the Pecheneg migrations that displaced the Khazar presence on parts of the western steppe; the loss of territory to the Pechenegs began the slow contraction of the khaganate's geographic control

Ruled during the period documented by Ahmad ibn Fadlan, the Arab traveler whose 921 account of the Volga Bulgars describes the Khazar dual-rule system in detail; the khaganate remained commercially powerful despite territorial pressures

Maintained the Khazar state through a period of increasing external pressure from the Rus' princes of Kyiv, who were expanding their control over the eastern Slavic tribes formerly tributary to the Khazars

Last documented Khagan of the Khazar Khaganate; the author of the famous Khazar Correspondence — letters in Hebrew to the Spanish Jewish courtier Hasdai ibn Shaprut of Córdoba, which remain the only surviving document written by a Khazar ruler; the khaganate was destroyed by Rus' Prince Sviatoslav I, who sacked Itil around 965–969 AD, ending three centuries of Khazar power