Shoan SHIBATA was a local samurai and a member of Nozuinshu (Nozuin was in Ono region, Bungo Province; presently Notsu machi, Usuki City) and the Shibata clan served the Otomo clan.
柴田氏は一族で大友氏に仕えていた国人・野津院衆（野津院は豊後国・大野郡。現在の臼杵市野津町）。