He was the grandson of OE no Masafusa who reached the court title of Chunagon (vice-councilor of state), and the son of OE no Korenobu (also called OE no Masatoki) who assumed Higo no kuni no kami (the governor of Higo Province).
中納言大江匡房の孫で、肥後国守大江維順（大江匡時）の子。