His place of birth is often assumed to be Kanda Castle (located in Nakagawa-machi, Nasu County, Tochigi Prefecture (the present-day Tochigi Prefecture)) as a kyojo (castle where the lord usually lived) for the Nasu clan in those days.
誕生地は当時の那須氏の居城神田城（現在の栃木県那須郡那珂川町(栃木県)）と推測されることが多い。