The Saigusa clan (also referred as the Saegusa clan) in Iba, Kanzaki County (present Iba-cho, Higashiomi City) was a distinguished clan in the Kai Province of which members were senior vassals to the Takeda clan.
神崎郡伊庭（現・東近江市伊庭町）の三枝氏は、甲斐国の名族で武田氏の重臣であった家である。