John Campbell, Earl of Atholl John Campbell, Earl of Atholl John Campbell, Earl of Atholl (died 1333) was a Scottish nobleman. John was the son of Sir Neil Campbell by his wife Mary Bruce. His grandparents were Sir Cailean Mór Campbell, Afraig of Carrick, Robert de Brus, 6th Lord of Annandale and Marjorie, Countess of Carrick. In 1316 he inherited from his father the lands confiscated from David Strathbogie, and in about 1320 he was created Earl of Atholl, though Strathbogie's son also claimed the title. He was married to Joan, former wife of Malise IV, Earl of Strathearn and daughter of Sir John de
Earl of Tyrone other end of Ireland. He was also given the subordinate title of Viscount Decies; both titles became extinct upon the death of his younger son, the third earl, in 1704; he left an only daughter, Lady Katherine Power, but both titles descended by patent to male heirs only. It was created a final time in 1746 for Marcus Beresford, 1st Viscount Tyrone, son-in-law of the last Power earl. His son was created Marquess of Waterford in 1789, and the title has since been a subsidiary title of the Waterford title. The king or chief of the O'Neills of Tyrone, Conn