According to "Heiji Monogatari," in 1880, under siege by the forces of the Heike clan who had received the report that Yoritomo raised his army, Mareyoshi killed himself after he performed a Buddhist memorial service for his father, Yoshitomo.
治承4年頼朝の挙兵の報を受けた平家方勢力によって包囲された希義が父義朝の為の仏事を行ってから自害した、となっている。