Samguk Sagi
The Korean history compilation "Samguk Sagi" presents two founding legends of Baekje, one crediting Onjo, and an alternate crediting Biryu. The "Samguk Sagi" relays only Onjo's descendants, not Biryu's, as the royal dynasty of Baekje. However, Biryu's descendants are thought to have maintained enough influence in Baekje for this legend to survive.