In 1443 (the third year of Kakitsu), Arimitsu HINO, from a branch of the Hino family, who was constantly talking of reviving the Southern Court, sent a force that was planning to assassinate Emperor Gohanazono to enter the Imperial Palace (the assassination attempt failed), where they stole two of the Three Imperial Regalia of Japan, the Ama no Murakumo no Tsurugi (the heavenly cloud gathering sword) and the Yasakani no Magatama (the Grand Jewels) before fleeing to Mt. Hiei accompanied by Tsuzoshu and Gonzoshu, brothers of the Southern dynasty lineage (the grandchildren of Gokameyama's younger brother) in what became known as the Kinketsu Incident (or the Incident at the Forbidden Palace).
1443年（嘉吉3年）には、南朝復興を唱える日野氏傍流の日野有光らの勢力が後花園天皇の暗殺を企てて御所に乱入（暗殺は未遂）、三種の神器の天叢雲剣と八尺瓊勾玉を奪い、南朝皇族の通蔵主・金蔵主兄弟（後亀山の弟の孫）を担いで比叡山に逃れる「禁闕の変」を起こした。