His wife, Elizabeth de Burgh, 4th Countess of Ulster, was a direct descendant of the previous owners, the de Clares, and the Manor of Clare was among the lands which she brought to her husband.
They met while still children when they were attached to the household of Elizabeth de Burgh, 4th Countess of Ulster.
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She was imprisoned for eight years by the English, from October 1306 to July 1308 at Burstwick-in-Holderness, Yorkshire and then transferred to Bisham Manor, Berkshire until March 1312.
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He imprisoned Bruce's sister Mary and Isabella MacDuff, Countess of Buchan, in wooden cages erected on the walls of Roxburgh and Berwick castles respectively, and then sent Bruce's nine-year-old daughter Marjorie to the nunnery at Watton.
The arms are Courtenay impaling the arms of his wife's father as Duke of York: Quarterly 1st: Royal arms of Lionel, Duke of Clarence; second and third, Elizabeth de Burgh, 4th Countess of Ulster; fourth, Edmund Mortimer, 3rd Earl of March.