This trouble occurred because Masatomo, who was the mokudai (deputy) for Owari Province, the chigyokoku (fiefdom) of Narichika, used violence against a jinnin (low-ranked Shinto priest or worker subordinated to a Shinto shrine) of Hiranosho Manor, Mino Province, which was owned by Enryaku-ji Temple.
成親の知行国である尾張国の目代・政友が延暦寺領美濃国平野荘の神人に乱暴を働いたことが発端だった。