Sandilch
Sandilch was a chieftain of the Utigurs in the 6th century. The origin of the name is probably Hunnic. Although he initially protested against leading the Utigurs into war against a related people, the Kutrigurs, the Byzantine Emperor Justinian I convinced him to do so through diplomatic persuasion and bribery. The Utigurs led by Sandilch attacked the Kutrigurs, who suffered great losses.
Sandilch's own words:
"It is neither fair nor decent to exterminate our tribesmen, who not only speak a language, identical to ours, who are our neighbours and have the same dressing and manners of life, but who are also our relatives, even though subjected to other lords".
After decimating each other, the remnant of Zabergan's and Sandilch's Bulgars acquired Dacia during the reign of Emperor Maurice.
The 17th century Volga Bulgar compilation Ja'far Tarikh represents Boyan Chelbir as the son of Bayan Tatra, and brother of Bulyak Bulgar. Further more Bayan Tatra is a son of Djurash Masgut, who is a son of Irnik, son of Attila.