Prince Motohira was the earliest ancestor of the Yozei-Genji (Minamoto clan) and the Seiwa-Genji (Minamoto clan) (which originated in the Yozei-Genji (Minamoto clan)), which would eventually act as head of the military caste (the warrior class); however, in recent years it has been said that Emperor Yozei was known as a dictator (as mentioned later), so the Seiwa-Genji (Minamoto clan) disliked him and wanted to have Emperor Seiwa as an ancestor.
元平親王は陽成源氏の祖であるが、のちに武家の棟梁となる清和源氏は実際は陽成源氏で、この元平親王を先祖とするが、後述するとおり陽成帝には暴君との評判があり、それを嫌って一代前の清和天皇に祖を求めたのだとの説が近年提示されている。