Kurt

…century, but in 635 Khan Kubrat led a successful revolt and organized an independent tribal confederation known as Great Bulgaria. After Kubrat’s death in 642, the Bulgars were attacked by the Khazars and dispersed. According to Byzantine sources, the Bulgars split into five groups, each under one of Kubrat’s sons.…

Unified under a single ruler, Kurt, or Kubrat (reigned c. 605–c. 642), the Bulgars constituted a powerful polity known to the Byzantines as Great Bulgaria, with the Kuban River as its southern frontier. After Kurt’s death his five sons split the people into five hordes. One of these five, remaining…