The Matsui clan as senior vassals of the Kawagoe-Domain: They served the lord of the Kawagoe Domain in Musashi Province the Matsudaira clan as Jodaigaro (chief counselor of a castle) and Hittokaro (the head of chief retainers).
川越藩重臣松井氏；武蔵国川越藩主松平氏の城代家老・筆頭家老であった松井氏。