In 1428 when Emperor Shoko was in critical condition, the Second Southern Court began revealing their active political ambitions, the 6th Shogun in the Muromachi bakufu (Japanese feudal government headed by a shogun), Yoshinori ASHIKAGA protected Prince Hikohito in the Fushimi Imperial Palace, and demanded Retired Emperor Gokomatsu, Chiten no kimi (ex-emperor who is in control of politics by ruling the cloister government), to appoint a new emperor.
1428年に称光天皇が危篤に陥ると後南朝勢力などが活動の気配を見せ、室町幕府6代将軍の足利義教は伏見御所にいた彦仁王を保護し、治天の君である後小松上皇に新帝指名を求める。