Dulo clan
The exact origin is obscure. Some researchers consider that the origin of the clan probably was Turkic. This proposition was suggested by Mikhail Artamonov, and was prompted by Lev Gumilev (1967), implying there may be made an association of the Dulo clan with the five Duolu (or To-lu) tribes of the Western Turks. The First Turkic Khaganate (552–581) was during the Göktürk civil war (581–593) divided into Western and Eastern Khaganate. The Western was led by "Onoq" (ten arrows), the five Duolu and five Nushibi tribes. Many modern historians consider that the first historical Bulgar ruler Kubrat belonged to the Dulo clan of the Western Turks - the so-called alliance Onogurs Bulgars.