Meanwhile, his date of death is given as August 8, 1189 in Kansei-Choshu-Shokafu, but it's given as October 1190 in Zoku-Gunshoruiju (Japanese history book).
なお、「寛政重修諸家譜」では文治5年（1189年）8月8日死去、「続群書類従」では建久元年（1190年）10月死去とある。