The main branch of the family of Murakami-Genji (Murakami Gen clan), the originator of which was minister of the right MINAMOTO no Morofusa (1008 to 1077), who was the son of Imperial Prince Tomohira, the eighth prince of Emperor Murakami.
村上天皇の第八皇子具平親王の男右大臣源師房（1008年-1077年）を祖とする村上源氏の嫡流。