William Sinclair, 1st Earl of Caithness
William Sinclair (1410–1480), 1st Earl of Caithness (1455–1476), last Earl (Jarl) of Orkney, 2nd Lord Sinclair and 11th Baron of Roslin was a Norwegian and Scottish nobleman and the builder of Rosslyn Chapel, in Midlothian.
Rosslyn Chapel that was founded by William Sinclair, Baron of Roslin, Lord Sinclair, Earl of Orkney and later 1st Earl of Caithness
Roslin Castle, seat of William Sinclair, Baron of Roslin, Lord Sinclair, Earl of Orkney and later 1st Earl of Caithness
Rosslyn or Roslin Castle, seat of the Sinclairs who were Barons of Roslin, reconstruction image
Earl of Orkney, historically Jarl of Orkney, is a title of nobility encompassing the archipelagoes of Orkney and Shetland, which comprise the Northern Isles of Scotland. Originally founded by Norse invaders, the status of the rulers of the Northern Isles as Norwegian vassals was formalised in 1195. Although the Old Norse term jarl is etymologically related to "earl", and the jarls were succeeded by earls in the late 15th century, a Norwegian jarl is not the same thing. In the Norse context the distinction between jarls and kings did not become significant until the late 11th century and the early jarls would therefore have had considerable independence of action until that time. The position of Jarl of Orkney was eventually the most senior rank in medieval Norway except for the king himself.
Ruins on the Brough of Birsay, once the seat of the early Norse jarls of Orkney. The Brough is now a tidal islet but in earlier times it was connected to Mainland Orkney by an isthmus.