On January 27, 1219 (old calendar), he assassinated MINAMOTO no Nakaakira and Sanetomo, who had visited Tsurugaoka Hachiman-gu Shrine to celebrate his assumption to udaijin (minister of the right), when they were leaving the shrine; it was snowing and the snow was about 60 centimeters deep.
建保7年（1219年）1月27日、雪が2尺(約60cm）ほど降りしきるなか、源仲章と実朝が右大臣拝賀のため鶴岡八幡宮に参詣して退出するところを暗殺。