The Earl of Orkney was originally a Norse jarl ruling Orkney, Shetland and parts of Caithness and Sutherland. The Earls were periodically subject to the kings of Norway for the Northern Isles, and later also to the kings of Alba for those parts of their territory in mainland Scotland (i.e. Caithness and Sutherland). The Earl's status as a Norwegian vassal was formalised in 1195. In 1232, a Scottish dynasty descended from the Mormaers of Angus replaced the previous family descended from the Mormaers of Atholl, although it remained formally subject to Norway. This family was in turn replaced by the descendants of the Mormaers of Strathearn and later still by the Sinclair family, during whose time Orkney passed to Scots control.