The Lordship of Mann is the feudal title held by the ruler of the Isle of Man, originating in the Norse Kingdom of Mann and the Isles. From 1405 it was held by the Stanley family (Earls of Derby) and then the Murray family (Dukes of Atholl), until the Revestment Act of 1765 transferred sovereignty to the British Crown. The title Lord of Mann is now held by the reigning monarch.