Chinjufu Shogun (Commander-in-Chief of the Defense of the North) FUJIWARA no Motoyori built a private Buddhist statue hall named 'Anrakuko-in Temple' on his estate, and his family line became known as the Jimyoin family when the temple was later renamed 'Jimyo-in Temple'.
鎮守府将軍を務めた藤原基頼が邸内に「安楽光院」と呼ばれる持仏堂を創設し、後にこれを「持明院」と名づけたことから、この家系を持明院家と称することとなった。