Robert de Brus, 5th Lord of Annandale, claimant to the Scottish throne 1290-92, sometime regent of Scotland
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.
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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.
Robert de Brus Lord of Skelton in the Cleveland area of Yorkshire, was a notable figure at the court of King Henry I of England, where he became intimate with Prince David of Scotland, that monarch's brother-in-law.
As part of Robert de Brus's 1307 expedition into Annandale and Galloway, led by Alexander de Brus and Thomas de Brus, an Irish sub king, Sir Reginald de Crawford and Malcolm, consisting of 1000 men and eighteen galleys they sailed into Loch Ryan and landed near Stranraer.
Oram, Richard, David: The King Who Made Scotland, (Gloucestershire, 2004)
The modern Skelton Castle incorporates part of the ancient stronghold of Robert de Brus who held it from Henry I.
The marriage between Marjorie of Carrick, and Robert de Brus of Annadale in 1271, conveyed to him both the castle and the earldom.