Dulo clan
The Nominalia of the Bulgarian khans states that he belonged to the royal Dulo clan and ruled for 15 years. According to the chronology developed by Moskov, Sevar would have reigned 721–737. Other chronologies place his reign in 738–754, but cannot be reconciled with the testimony of the "Namelist". According to historians such as Steven Runciman and David Marshall Lang, Sevar is the last ruler of the Dulo dynasty, and with him died out the lineage of Attila the Hun.