However, Imperial Prince Osabe was entrapped by a scheme of FUJIWARA no Yoshitsugu and a FUJIWARA no Momokawa (brothers) from the Ceremonial House of the Fujiwara clan who opposed his investiture of the Crown Prince; and eventually he was demoted to common people for allegedly having put a curse on Emperor Konin, thereafter he and his mother died an unnatural death.
しかしながら、他戸親王の立太子に反対していた藤原式家の藤原良継・藤原百川兄弟の陰謀に遭い、光仁天皇を呪ったとして庶人に落とされ、母共々変死した。