Sir Thomas Boyd; 2nd feudal Baron of Kilmarnock; captured along with David II at Battle of Neville's Cross 1346. [Burke's Peerage]
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Notes from Sally Walmsley [Geniedash@bigpond.com]:
We know little about the first Sir Thomas Boyd, who succeeded to the Boyd estates. He evidently followed the Family's war-like traits, as he accompanied King David II to Durham, and was captured by the English at the battle of Neville's Cross in 1346. Either he or his son built Dean Castle, replacing the wooden fort atop the motte. Dean Castle was to be centre of the Kilmarnock Estates until the 1700's.
We do not know to whom Sir Thomas was married. He left three sons.