However, Emperor Heizei and Emperor Saga did not accept this, and when Imperial Prince Takaoka, who was the crown prince of Emperor Saga, died in the Kusuko Incident, Imperial Prince Otomo became the Crown Prince on the premise that Tsuneyo would succeed to the imperial throne.
しかし、平城・嵯峨天皇はこれを認めず、薬子の変で嵯峨天皇の皇太子であった高岳親王が廃されると、恒世への継承を前提として大伴親王が皇太子とされた。