According to the legend of Shionomatsu, the Utsunomiya clan, dispatched by Ujimitsu ASHIKAGA, Kamakura kubo (Governor-general of the Kamakura region) who placed Ou under his jurisdiction, entered Shionomatsu in 1392, but rebellious Akimochi OSAKI, Oshu Tandai (supervisor for the civil government and military affairs in Oshu), in cooperation with Mitsunobu KASAI, searched out and killed the Utsunomiya clan in 1400.
塩松の伝承に拠れば、奥羽まで管轄下に置く事になった鎌倉公方・足利氏満によって1392年宇都宮氏が塩松に入部してきたが、反発する奥州探題・大崎詮持が1400年に葛西満信らと共に宇都宮氏を追討。