Kazuyoshi himself started out as a retainer of Nagahide NIWA, but after Nagahide's death, he began serving Hideyoshi TOYOTOMI, and was granted jurisdiction over a territory worth 65,000 koku in Usuki in Bungo province.
一吉ははじめ丹羽長秀の家臣であったが、長秀の死後、豊臣秀吉に仕えて豊後国臼杵に6万5000石の所領を領した。