When his grandfather Shigeharu retired in 1596, as his father Kazushige had already been dead in 1582, the legitimate grandchild Kazuharu took over the shoryo (territory) in Kii Wakayama.
慶長元年（1596年）祖父重晴が隠居したとき、父一重は既に天正十年に死去していたため、嫡孫の一晴が紀伊和歌山の所領を受け継いだ。