One theory proposes that Hideyoshi TOYOTOMI was behind the decision to grant him the status of Shinno, and it is said that there were plans to relocate Emperor Go-Yozei to Beijing as Emperor of China and install Ryonin as the Emperor of Japan in the event that the Japanese invasion of Korea (1592–1598) became successful and conquered the Ming Dynasty of China.
一説にはこの親王宣下の背景には豊臣秀吉の後押しがあり、朝鮮出兵が成功して明を征服した暁には後陽成天皇を北京市に遷して、良仁親王を日本の天皇にする計画が存在したとも言われている。