Ujikuni was a person concerned with the Nagurumi Incident (he was a commander of Kuninori INOMATA who was a keeper of Numata-jo Castle) that led to the fall of the Hojo clan due to his indiscreetness.
短慮により北条氏の滅亡のきっかけとなったと言われる名胡桃事変の当事者（沼田城代猪俣邦憲の指揮官）であった。