WILLIAM DE HAYA, who flourished about 1170, is said to have been the father of two sons, of whom the younger, Robert, was ancestor of the Marquises of Tweeddale. From the elder son, William, came the house of Erroll, and his descendant, Sir William Hay, was created Earl of Errol in 1453. The Hays of Erroll hold the office of Hereditary Constable of Scotland, this title having been conferred in 1314 by King Robert Bruce on the grandfather of the 1st Earl. The 4th Earl fell at Flodden in 1513, and the 13th Earl, dying unmarried in 1717, was succeeded by his sister as Countess of Erroll. But on her death in 1758, without issue, the title went to James Boyd, son and heir of the 4th (and attainted) Earl of Kilmarnock, by his wife, Ann Livingstone, who was the daughter and heiress of the Earl of Linlithgow and Callander, and his wife, Margaret Hay, sister of the above-mentioned Countess of Erroll. On succeeding to the title James Boyd changed his name to Hay, in accordance with clan law; and his descendants succeeding to the Earldom have been continual Chiefs of the Clan Hay.
THE name Campbell first appears in 1216, in connection with a proprietor of lands in Stirling; but the first of importance was Neil Campbell, who, in 1296, was made King Edward’s Baillie over lands in Argyll. His great-grandson was created Lord Campbell by James II, and was the first of the family to take the title of Argyll. His grandson, Colin, was made Earl of Argyll in 1457, and Baron of Lorn in 1470. The Marquis of Argyll was the great leader of the Covenanters during the Civil Wars in the reigns of Charles I and Charles II. The 8th Earl was created Duke of Argyll in 1701. The Peerages and estate descended to John, second Duke of Argyll and Earl of Greenwich (died 1743). He was succeeded by his brother, who died without issue, and so the title devolved upon his cousin, General John Campbell of Mamore. Inveraray Castle is the seat of the Campbell Chiefs, whose designation is MacCailein Mhor.