Dulo clan
The "Nominalia of the Bulgarian khans" states that Asparuh belonged to the Dulo clan and reigned for 61 years. This long period cannot be accepted as accurate due to chronological constraints, and may indicate the length of Asparuh's life. According to the chronology developed by Moskov, Asparuh would have reigned 668–695. Other chronologies frequently end his reign in 700 or 701 but cannot be reconciled with the testimony of the "Namelist". According to the Byzantine sources, Asparuh was a younger son of Kubrat, who had established a spacious state ("Great Bulgaria") in the steppes of modern Ukraine. Asparuh may have gained experience in politics and statesmanship during the long reign of his father, who probably died in 665 (apud Moskov). According to Djagfar Tarikhy (a work of disputed authenticity) Asparukh was made the leader of the Onogur tribe by his father. After his father's death, Asparuh would have acknowledged the rule of his older brother Bat Bayan, but the state disintegrated under Khazar attack in 668, and he and his brothers parted ways, leading their people to seek a more secure home in other lands.