Kameyama was disappointed and became a priest in 1289 (aged 41), and was accused of being involved in an incident where bushi Tameyori ASAHARA and others who lost their territory during the Shimotsuki Incident, invaded the Imperial Palace and tried to assassinate Fushimi, and had to submit an appeal to the bakufu to clear his name in 1290.
亀山は失意のうちに正応2年に出家（41歳）し、翌正応3年に霜月騒動で所領を失った武士浅原為頼らが内裏に乱入し伏見を殺害しようとする事件が起きると関与を疑われ、起請文を幕府に提出して身の潔白を主張しなければならなかった。