Robert the Bruce (1274-1329), King of Scotland, who took Castle Rushen and brought the Isle of Man under Scottish rule.

He landed at Ramsey and marched south to Castletown. Castle Rushen was held against him for six months, obstinately, by the man the Chronicle of Man calls Lord Dungawi Macdoual, that is Duncan de Ergadia or Duncan Macdougal, a nephew of the Black Comyn, and some writers ascribe the siege not to the King but to his brother Edward Bruce. When the castle fell the power of the Bruce party was established on the Island, and it held for the most part until the reconquest.

He gave the Island away to his nephew. The charter of 1318 is addressed by Robert, by the grace of God King of the Scots, to all honest men of his land, clergy and laity, and confirms to Thomas Randolph, Earl of Moray and Lord of Annandale, his dearest nephew, the Isle of Man to be held under him. It was witnessed at Berwick-upon-Tweed on the twentieth day of December in the nineteenth year of the reign, by the Earl of Strathearn, Hugh Earl of Ross, Walter the Steward of Scotland, James Lord of Douglas, and Gilbert de Hay the Constable.

The Island changed hands more than once in those years. Sir Henry de Beaumont had been Lord of Man until 1310, and Edward II, whose Scottish rolls carry an instruction that the men of the Isle of Man be well treated, dismissed him. A band of Irish under Richard de Mandeville ravaged the Island in 1316. Alice, daughter of Alexander de Ergadia Lord of Lorn and widow of Reginald King of Man, entered a conspiracy against Bruce in 1320 and was attainted for it. The Scottish hold was ended by William Montacute the younger, Earl of Salisbury, in 1343.