After the preceding king Bunseo was assassinated by Chinese agents, Biryu ascended to the throne because Bunseo's sons were deemed too young to rule. This appears to have been part of a power struggle between the two branches of the Baekje royal family, the descendants of the 5th king Chogo (Biryu's ancestor) and that of the 8th king Goi.
In 312, he appointed Hae Gu to head the military. In 327, he stopped a rebellion by his stepbrother U Bok. In 337, he received a mission from the neighboring Silla.
Japanese historians suspect Biryu, like Saban, as the progenitor of certain aristocratic clans of Yamato period Japan. Any genealogical records either did not exist or have been lost/destroyed for over a millennium.