Mary de Monthermer

Mary de Monthermer
Countess of Fife
BornOctober 1297 (1297-10)
Died1371
SpouseDuncan IV, Earl of Fife
IssueIsabella, Countess of Fife
FatherRalph de Monthermer, 1st Baron Monthermer
MotherJoan of Acre

Mary MacDuff, Countess of Fife (née de Monthermer; October 1297 – c. 1371) was an English noblewoman. She was a daughter of Ralph de Monthermer, 1st Baron Monthermer and his wife Princess Joan, thereby making her the grandchild of King Edward I of England. Other sources have her being born in 1298.