He was captured by forces at Loch Ryan, Galloway, Scotland and later executed by the English.
He is said to have been a learned man who was educated at Cambridge and was later named Dean of Glasgow.
[1] On 9 February 1307 shortly after King Robert returned to the Isle of Arran from Rathlin Island, Alexander, his brother Thomas de Brus and Sir Reginald Crawford, sailing 18 galleys, landed with a force of some 1000 Irishmen at Loch Ryan.
They were met by a force of Gallowaymen led by Dungal MacDouall, who was a supporter of the Comyns.
Their force was overwhelmed in the ensuing battle and all three leaders were captured, badly wounded.