He was the eldest son of Mutimir (r 851–891) of the Vlastimirović dynasty, who ruled during the expanding and Christianization of Serbia. His father had with his brothers Strojimir and Gojnik, defeated the Bulgar Army sent by Tsar Boris I of Bulgaria and led by his son Vladimir.
Vladimir was captured together with 12 boyars. Petar, the son of Gojnik, was kept at the Serbian court of Mutimir for political reasons, but he soon fled to Branimir of Croatia. Bran later returned and led an unsuccessful rebellion against Petar in 894.
Bran was defeated, captured and blinded (blinding was a Byzantine tradition that meant to disqualify a person to take the throne)
The Pribislav mentioned in the Gospel of Cividale (codex aquileiensis), is most likely referring to Pribislav.
