A portrait of MINAMOTO no Yoritomo which is in the possession of the British Museum with a credit of the portrait of Yoritomo obviously copied the unconfirmed portraits of MINAMOTO no Yoritomo in Jingo-ji Temple; the period of drawing is regarded from the period of the Northern and Southern Courts to the Muromachi period, and it strongly supported the popular theory.
また、明らかに神護寺伝源頼朝像を模写して描かれた大英博物館所蔵の源頼朝像には、賛に頼朝像との明記があり、成立時期が南北朝期-室町期と目されることから、通説を補強する有力な根拠となっていた。