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Earl of Portmore was a title in the Peerage of Scotland. It was created in 1703 for the Scottish military commander David Colyear, 1st Lord Portmore. He had already been created Lord Portmore in 1699 and was made Lord Colyear and Viscount of Milsington at the same time as he was granted the earldom, also in the Peerage of Scotland. He was the son of Alexander Colyear, who had been created a Baronet, of Holland, in the Baronetage of England on 20 February 1677. Lord Portmore married Catherine Sedley, Countess of Dorchester, a former mistress of James II. He was succeeded by his only surviving son, the second Earl. He represented Wycombe and Andover in Parliament. His grandson, the fourth Earl (who succeeded his father), sat as Member of Parliament for Boston. The fourth Earl died without surviving male issue in 1835 when the titles became extinct.