 In 807, Rüti's quarter "Fägswil" was first mentioned in a document of the Abbey of Saint Gall.In a document of the German Emperor Otto II (972), the municipality was described as "Riutun", the Old High German word for "Roden" (= to convert forest into farmland), and later forwarded to the name of "Rüti".In 1206 the Rüti Monastery was given by Liutold IV, Duke of Regensberg, and the present Reformed church was completed to 1283.