Emperor Saga
The , also known as the , occurred in the early Heian period. In 810, Emperor Saga and ex-Emperor Heizei stood in opposition, but Saga's side quickly raised enough troops to resolve the confrontation, making Heizei become a monk. Heizei's lover the Fujiwara no Kusuko and her older brother the "sangi" Fujiwara no Nakanari were punished for the incident.