There are various views on the reason why the man from Mino Province moved to Kazusa Province, and it is commonly said that he was a vassal of the Muromachi bakufu (Japanese feudal government headed by a shogun) in Kyoto when he was young.
美濃出身の彼がなぜ上総国に移ったのかについては諸説あるが、一般的には若い頃は京都にて室町幕府の幕臣であったとされている。