One theory holds that the reason Yoshitomo moved to Togoku from Kinai (area near Kyoto that includes Kawachi Province as the base of the Kawachi-Genji (Minamoto clan)) is that relations were cut by his father Tameyoshi and he was disinherited.
一説によれば、義朝が幼少期に河内源氏の本拠地河内国のある畿内を離れ東国に下ったのは、父の為義から廃嫡同然に勘当されたためではないかとされる。