There is a theory which states that the incident of Imperial Princess Inoe's curse on Emperor Konin was a plot of the Ceremonial House of the Fujiwara clan, such as FUJIWARA no Yoshitsugu and FUJIWARA no Momokawa, who attempted to install Imperial Prince Yamanobe as the Crown Prince (or that the Imperial Princess was brought to bay by their political power).
井上内親王の光仁天皇呪詛事件は、山部親王の立太子をもくろむ藤原良継や藤原百川ら藤原式家一派の陰謀だと（あるいは彼らの政治的圧力によって内親王が追い詰められた結果とも）いう説がある。