The was a conspiracy that took place in 866 and centered around the destruction of the main gate (Ōtenmon) of the Imperial Palace in Kyoto, Japan. This event is known to scholars today primarily based on the depiction of it in the narrative handscroll (emaki) called Ban Dainagon Ekotoba (The Picture-narrative of Great Minister Ban). This event, and Fujiwara no Yoshifusa's handling of it, served Yoshifusa well, politically. Many of those executed were his political rivals, and he found himself promoted to Regent (Sesshō) soon afterwards.