Clan Sinclair ( ) is a Highland Scottish clan which holds the lands of Caithness, the Orkney Islands, and the Lothians. The chiefs of the clan were the Barons of Roslin and later the Earls of Orkney and Earls of Caithness. The Sinclairs are believed to have come from Normandy to England during the Norman conquest of England, before arriving in Scotland in the 11th century. The Sinclairs supported the Scottish Crown during the Scottish–Norwegian War and the Wars of Scottish Independence. The chiefs were originally Barons of Roslin, Midlothian and William Sinclair, 1st Earl of Caithness and Baron of Roslin founded the famous Rosslyn Chapel in the 15th century. He split the family lands, disinheriting his eldest son from his first marriage, William ("the Waster"), who inherited the title of Lord Sinclair, instead giving the lands of Caithness to the second son from his second marriage, William Sinclair, 2nd Earl of Caithness, in 1476, and the lands at Roslin to his eldest son from his second marriage, Sir Oliver Sinclair. In the 16th century the Sinclairs fought against England during the Anglo-Scottish Wars and also feuded with their neighbors the Clan Sutherland. During the Jacobite rising of 1715 the Sinclairs supported the Jacobite cause, but during the Jacobite rising of 1745, while the clan largely had Jacobite sympathies, their chief, the Earl of Caithness, supported the British-Hanoverian Government. The current chief is Malcolm Sinclair, 20th Earl of Caithness. History Origins of the clan No certain record exists but it is likely that the Sinclairs came from Saint-Clair in Normandy. The Saint-Clairs first went to England (before they came to Scotland) with William the Conqueror during his invasion of England. The name was originally "Saint-Clair" which was a place name. Richard of Saint-Clair and Brittel of Saint-Clair are both mentioned in the Domesday Book. William of Saint-Clair accompanied Saint Margaret of Scotland, daughter of Edward the Exile to Scotland in 1068, where she eventually married Malcolm III of Scotland. In return for his efforts, the king supposedly granted Sinclair the barony of Roslin, Scotland "in free heritage". One of the earliest recorded Sinclairs in Scotland was Henry of Saint-Clair/Sinclair, who obtained a charter for the lands of Herdmanston in Haddingtonshire in 1160. The chiefs of Clan Sinclair, the Earls of Caithness, descend from William St. Clair who was sheriff of Edinburgh and who was granted the barony of Roslin (Rosslyn)