When Emperor Shoko became critical again in August and September 1428, the sixth Shogun Yoshinori ASHIKAGA protected Sadafusa's biological son, Prince Hikohito, and asked the Retired Emperor Gokomatsu to appoint a new Emperor.
正長元年（1428年）7月に再び称光天皇が重態に陥ると、六代将軍の足利義教は貞成の実子である彦仁王を庇護し、後小松上皇に新帝の指名を求める。