He was adopted by Imperial Prince Fushiminomiya Sadafusa, and in May 1439, he was given the title of Imperial Prince, and three years later, in 1442, he was appointed as Danjoin (President of the Board of Censors) ("Sagan"- sandstone).
伏見宮貞成親王の猶子となり、永享11年4月に親王宣下を受け、3年後の嘉吉2年（1442年）には弾正尹に補任された（『砂巖』）。