There are various theories about his birth mother (which varies from a daughter of Seishu ANDO to a daughter of Shigeyasu ANDO, who was from the same clan and was the saemonshoi (junior lieutenant of the left division of outer palace guards) of 甘羅令 of Kozuke Province).
生母は諸説がある（安東聖秀の女、同族の上野国甘羅令（甘楽郡地頭）の安藤重保（左衛門少尉）の女など）。