That is to say, Yasumune's son, Sadayasu UTSUNOMIYA maintained his influence in Iyo Province of the Shikoku region during the period of the Northern and Southern Courts (of Japan) and then moved to Nakatsu, Chikuzen Province which was the Kii clan's base, together with Imperial Prince Kaneyoshi of the Southern Court.
すなわち、泰宗の子の宇都宮貞泰は、南北朝時代(日本)に四国伊予国に勢力を保ち、南朝の懐良親王と共に城井氏の拠点の豊前国仲津に移った。