Background
Masamitsu was the son of Hoshino Masanao, and after having lent his support to Tokugawa Ieyasu at the 1600 Battle of Sekigahara, he was given the Takatō fief in 1600.With his father"s death the following year in Takatō, Masamitsu became the new head of the Hoshina family and served throughout the Osaka Campaigns of 1614 and 1615.