In 399, he besieged the Emperor's palace, and tried to kill the Emperor for fear of being found out about pretending to be the Emperor and raping Kurohime who was the fiance of his older brother, Emperor Richu.
仁徳天皇87年（399年）、兄履中天皇の婚約者黒媛を天皇の名をかたって犯してしまい、事の発覚を恐れて、天皇の宮殿を包囲、焼殺しようとするが失敗。