Soon after Imperial Prince Osabe was overthrown following his mother, Imperial Princess Inoe, who was overthrown in a rebellion, and Kanmu, born to Emperor Konin and Niikasa TAKANO, the daughter of the descendant of the Paekche Royal Family, became the fiftieth Emperor.
しかし間もなく母井上内親王の謀反による廃后とともに他戸親王も廃太子となり、皇太子は、光仁天皇と百済王族の末裔の娘高野新笠との間に生まれた桓武天皇、後の第50代桓武天皇となった。