Before his father's death in 1446, he took possession of Dunbar Castle, without authority; Joan Beaufort, the Queen-Dowager, resided there for some time while he held it.
On 19 December 1450 he had a charter of the lands of Little Lamberton, commonly called Sherfbygyn, in Berwickshire.
On 20 December 1451 he had a Crown charter of the Lordship of Hailes and other lordships and lands, which his predecessors formerly held in heritage of the Earls of March, who again held them of the Crown in chief; also the lands of Prendergast and others in the sheriffdom of Berwick, with all rights in the lands formerly held by George II, Earl of March, and forfeited by him:- the whole erected into a free barony to be called the feudal barony of Hailes.
Patrick was one of the conservators of truces with England in the years 1449, 1451-7 and 1459, was confirmed as Shire-reeve (Sheriff) of Berwickshire on 20 May 1452, and he or his namesake grandson was the last Scottish Keeper & Captain, for less than a year in 1482, of Berwick Castle.
His grandson Patrick (who would become the first Earl of Bothwell), succeeded him as Lord of Hailes, as his eldest son Adam predeceased him.