He lost his father when he was 11years old, and at the age of 14, he became Mitsushige's junior Kosho (a boy before genpuku, who served a nobleman as a pageboy) (so called Kogosho or Chigokosho), and changed his name to Ichijuro
11歳で父に死別し、14歳のとき、光茂の小々姓（いわゆる児小姓・稚児小姓）となり、名を市十郎と改める。