In 1181, it was discovered that the land in Tama county which was added to Shigenari's territory last year was actually the property of Hirosada HEITA; learning about it, Yoritomo became angry.
養和元年（1181年）、前年に所領として加えられた多磨郡の土地が、本来は平太弘貞の所有である事が発覚し、頼朝の怒りを受ける。