Donnchadh's granddaughter Marjorie (Marthoc, Martha, Margaret), who later held the title in her own right, married Robert de Brus, who later became Lord of Annandale.
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He was apparently a nutritus, or foster son, of Robert V de Brus, Lord of Annandale, and seems to have been closely linked in some way to Adam de Kirkcudbright, the man who held the church of Dalton in Annandale.
It was at this point that Robert Bruce, 6th Lord of Annandale (father of the future King Robert the Bruce) was appointed by Edward as the governor of Carlisle Castle.