According to Hankanpu (Genealogy of the Protectors of the Shogunate), Yasufuji UTSUNOMIYA belonged to the Southern Court and settled in Okubo, Mikawa Province from Echizen Province when Yoshisada NITTA was subjugated.
『藩翰譜』によると宇都宮泰藤は南朝方で、新田義貞が討たれた時、越前国を落ち三河国大久保に住んだことにはじまるという。