May 1185 (April under the old lunar calendar), a letter that impeached Yoshitsune was delivered to Yoritomo, from Kagetoki KAJIWARA who worked in Samurai-dokoro shoshi (Governor of the Board of Retainers) and served Yoshitsune as an assistant in the search and killing of Taira clan.
文治元年（1185年）4月、平氏追討で侍所所司として源義経の補佐を務めた梶原景時から、義経を弾劾した書状が届く。