Mary de Monthermer

In 1307, her grandfather Edward I and her uncle Edward II arranged for her to wed Donnchadh IV, Earl of Fife (1289–1353).^[1][6] A papal dispensation was granted on 4 November 1307.^[6] A posthumous child, Duncan had spent his minority in England.^[6] As was common for the time, she was very young – only nine years old. They had one surviving daughter, who was born fourteen years after they married. She would come to inherit Duncan's lands:

• Isabella, Countess of Fife (sometimes called Elizabeth)^[7] (1320–1389); married four times.

Near 6 November 1314, Duncan was able to free himself from English control and leave for Scotland. Mary would not join him until January 1320.^[6] In 1332, Mary and her daughter were captured at Perth by supporters of King David II of Scotland. Isabella was sent as a ward to Northumberland, where she married her guardian Sir William Felton. Felton was styled "Lord of Fife" in right of his wife, as Isabella had no brothers.

In 1346, Mary's husband was tried for treason and sentenced to a traitor's death by Edward III of England. He was able to obtain mercy however and was permitted to return to Scotland to raise money for his ransom, which he did in 1350. Duncan died three years later. Mary would die at least eighteen years later (sometime after 1371);^[1][6] their daughter succeeded as Countess of Fife, but resigned the earldom to Robert Stewart, Duke of Albany the same year her mother died.^[6]

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