He was born in Kyoto and spent his childhood there, then moved to Togoku (Kanto region) in his boyhood and grew up under the aegis of Kazusa clan.
京都生まれで幼少期を京都で過ごすが、少年期に東国（関東地方）に下向し、上総介氏等の庇護を受け同地で成長した。