However, in 1779 when Emperor Gomomozono died without leaving an heir, there was a rumor that Imperial Prince Kuniyori might have poisoned him, which sparked uproar among people such as Kyoto shoshidai (the Kyoto deputy) and the Retired Emperor Gosakuramachi, but Kuniyori's innocence was soon vindicated.
ところが、安永8年（1779年）に後桃園天皇が男子を残さずに死亡すると、邦頼親王が天皇を毒殺したとする風説が流され、京都所司代や後桜町上皇までが乗り出す騒ぎになったが、間もなくその無実が判明する。