The following is a list of Khazar rulers.
The Khagans were supreme chiefs of the people, holding positions of much influence and spiritual authority, but with little day-to-day command.
The Cäğfär Taríxı purports to be a compilation of early Bulgar historical material, assembled (or at least written in its present form) in the late 17th century. It has been used by Volgan Tatars to document that their antecedents in their region extend back in time by many centuries.
Critics claim the Cäğfär Taríxı to be a forgery, created by or at the behest of the Soviet Secret Police (then the NKVD) in the 1930s for the purpose of creating divisiveness and factionalism within the ethnic Tatars of that era. The Soviet government did create spurious historical documents on several occasions. The historicity of the people that it refers to is therefore questionable, so until additional documentation comes to light, Khalga and Kaban should be regarded warily at best.
The Khagan Beks were war chiefs, military commanders who exercised considerable day-to-day authority, and were sometimes regarded by outsiders as the supreme lords of the Khazar nation.
Hazer Tarkhan's army was annihilated at Itil in 737 AD, and the Caliphate imposed Islam upon the Khazars. Nevertheless, the Caliphs could not adequately garrison Khazaria, and within a few years the Khazars were once again independent. The famous conversion to Judaism seems to have occurred about this time. The date of the actual conversion to Judaism is a matter of some controversy. According to Yehuda Halevi in Kuzari, it occurred around 740 AD, though some Arab sources point to a date closer to the end of the 8th century or early 9th century, and more recent scholars have postulated that 861 AD, the date of St. Cyril's visit to Khazaria, was the year of the conversion to Judaism.
The 2002 discovery of a coin hoard in Sweden further complicates the issue, as some of the coins bear dates from the early 9th century and the legends "Ard al-Khazar" (Land of the Khazars) and "Moses is the Prophet of God". Since the coins date from 837 AD or 838 AD, some scholars think the conversion occurred in 838 AD. Bulan Sabriel was the Khazar ruler at the time of the conversion, but in the list below all the dates up to Aaron I are based on a presumed 740 AD conversion date.