He and his father were distinguished in military service during Meitoku War and helped uplift the position of the Isshiki clan in bakufu (Japanese feudal government headed by a shogun); then in January of 1392, he was appointed as Military Governor of Tango Province.
父とともに明徳の乱で軍功を示め、幕府内での一色氏の地位を高め、明徳3年（1392年）正月には丹後国守護にも補任された。