When Yoritomo decided to track down and kill his younger brother, MINAMOTO no Yoshitsune, he sent a letter, in which he snapped angrily at gokenin (immediate vassals of the shogunate in the Kamakura period) in Kyoto (see the section Exclusion of Yoshitsune in 1185 in the page of MINAMOTO no Yoritomo).
頼朝が弟・源義経を追討した際に出された在京御家人を罵った手紙（1185年・源頼朝義経追放参照）がある。