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In page Marjorie, Countess of Carrick:

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Margaret Bruce who married Sir William de Carlyle is thought by Barrow not to be their daughter.[citation needed] It is speculated that Thomas Randolph, 1st Earl of Moray was the son of Marjorie's daughter, Martha, from her first marriage with Adam. It is put forward as an explanation of why Thomas Randolph was described as a nephew of Robert the Bruce. There is evidence that an "eldest daughter" married into the family of the earls of Mar, giving rise to the now discounted first marriage of Christina to the son of the earl, Gartnait.