Khazar Khaganate

The Khazar Khaganate was a powerful semi-nomadic Turkic polity that emerged on the Pontic-Caspian steppe around 650 CE, after the dissolution of the Western Turkic Khaganate, and dominated the Eurasian steppe corridor between the Volga-Don region, Crimea, and the northern Caucasus for roughly three centuries.

Governed as a diarchy in which a sacral khagan held symbolic supremacy while a bek wielded actual military and administrative power, the Khaganate ruled a multiethnic, multireligious population from successive capitals at Balanjar, Samandar, and finally Atil on the lower Volga. The Khazars were a pivotal commercial power, controlling key arteries of the Silk Road and the north-south river trade and profiting from transit tariffs, furs, and the slave trade, fostering a stable 'Pax Khazarica' that allowed merchants safe passage across western Eurasia. They fought a prolonged series of Arab-Khazar wars in the 7th and 8th centuries, allying with Byzantium and helping to halt the northward expansion of the Umayyad Caliphate beyond the Caucasus. Most distinctively, the Khazar ruling elite converted to Rabbinic Judaism during the 8th century, making the Khaganate one of the few medieval states with a Jewish ruling class. Decline set in during the late 9th and 10th centuries amid pressure from Pechenegs and Magyars and the rise of the Volga Bulghars, culminating in the campaigns of Sviatoslav I of Kievan Rus, who sacked the fortress of Sarkel in 965 and the capital Atil around 968-969, ending Khazar imperial power.