He was born as the last son of Prince Yohira (世平王), the former family head, and in February 1455, when he was forty years old, he was given the title of Imperial Prince as an adopted child of Imperial Prince Fushiminomiya Sadafusa.
先代・世平王の末息子として生まれ、享徳4年（1455年）2月、40歳の時に伏見宮貞成親王の猶子として親王宣下を受ける。