In 1159, Yoritomo was appointed to Josaimonin kurodo (Chamberlain of Josaimonin) when Imperial Princess Muneko became nyoin (a close female relative of the Emperor or a woman of comparable standing) Josaimonin with the issue of an Imperial letter to permit use of "In" title.
平治元年（1159年）に統子内親王が院号宣下を受け、女院上西門院となると上西門院蔵人に補された。