He took the opportunity of the turmoil in Kyoto that took place after Kakitsu War in 1443 and stole Jingi (sacred treasures) of Yasakani no Magatama (sacred jewel or necklace) and Ama no Murakumo no Tsurugi Sword and hid on Mt. Hiei during the incident of the invasion of Kyoto (Kinketsu Incident) by Sonshuo (self-proclaimed emperor).
1443年（嘉吉3年）の嘉吉の乱の後、京都の動揺に乗じ、その後の尊秀王による京都侵入事件（禁闕の変）が起こると神璽と天叢雲剣の神器を奪い比叡山に籠った。