COMYN, JOHN (d. c. 1300), Scottish baron, was a son of John Comyn (d. 1274), justiciar of Galloway, who was a nephew of the constable of Scotland, Alexander Comyn, earl of Buchan (d. 1289), and of the powerful and wealthy Walter Comyn, earl of Mentieth (d. 1258). The elder Comyn took a prominent part in the affairs of Scotland with his uncle the earl of Buchan and had interests in England as well as in his native land ; he fought for Henry III. at Northampton and at Lewes, and was imprisoned for a short time in London. The younger Comyn, who had in herited the lordship of Badenoch from his great-uncle the earl of Mentieth, was appointed one of the guardians of Scotland in 1286, and shared in the negotiations between Edward I. and the Scots in 1289-9o. When Margaret, the Maid of Norway, died in 1290, Comyn was one of the claimants for the Scottish throne, but he urged the claim of his brother-in-law, John Baliol. After sup porting Baliol in his rising against Edward I., Comyn submitted to Edward in 1296.