Imperial Prince Yoshimune was born in 1233 after Emperor Juntoku was driven into exile to Sadogashima island, and though the time is uncertain, he went to Kyoto and was raised in his grandmother Shumeimonin's place and given the title of Imperial Prince there, and inherited Shichijoin estate from his grandmother in 1251.
善統親王は順徳天皇が佐渡島に流刑になった後の天福元年（1233年）に生まれた皇子で、時期ははっきりしないが上洛して祖母・修明門院のもとで成長し、親王宣下を受け、建長3年（1233年）に祖母から七条院領を相続した。