The Matsudaira clan expanded its territory remarkably under control by Kiyoyasu MATSUDAIRA, but, as Kiyoyasu was killed by a vassal in Moriyama kuzure in 1535, it surrendered to the Imagawa clan.
松平氏は松平清康の時代に版図を雄飛させるが、1535年守山崩れによって清康が家臣に殺されると今川氏の陣門に下った。