With the outbreak of war between England and Scotland, Comyn, his father, and his cousin, John Comyn, Earl of Buchan, crossed the border and attacked Carlisle, defended for King Edward by Robert Bruce, Earl of Carrick, the father of the future king.
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John Comyn, the first Anglo-Norman Archbishop of Dublin, created a new collegiate church at St Patricks parish church, a collegiate church his successor Henry de Loundres turned into a second cathedral.
In 1302, with six other ambassadors including John Comyn, Earl of Buchan, he was sent to solicit the aid of the French king against Edward, to whom he was once again compelled to swear fealty at Lanercost on 23 October 1306.
Seizing the political high ground, Bruce was crowned at Scone on 25 March in an improvised ceremony.
The oldest of the regiments of the Maison du Roi was the Garde Écossaise, formed in 1440, and traced its ultimate origins to the Scots forces brought to France in 1419 by John Stewart, Earl of Buchan, to fight against the English in the Hundred Years' War.
The 13th-century castle was originally the property of the Comyn Earls of Buchan.