"Yasakani no magatama" (curved jewels), one of the sanshu no jingi (the three imperial regalia), had been carried away and kept by the Gonancho in the Kinketsu incident in 1443.
嘉吉3年（1443年）の禁闕の変で、三種の神器の1つ『八尺瓊勾玉』は後南朝に持ち去られたままだった。