Mary MacDuff, Countess of Fife (née de Monthermer; October 1297 – circa 1371) was an English noblewoman. She was a daughter of Ralph de Monthermer, 1st Baron Monthermer and his wife Joan of Acre. Other sources have her being born in 1298.
Marie de Monthermer, née en octobre 1297 et morte après le 30 mars 1371, est une noble anglaise, devenue par mariage comtesse de Fife. (fr)
Mary MacDuff, Countess of Fife (née de Monthermer; October 1297 – circa 1371) was an English noblewoman. She was a daughter of Ralph de Monthermer, 1st Baron Monthermer and his wife Joan of Acre. Other sources have her being born in 1298. (en)
Mary MacDuff, Comtesse Fife (née de Monthermer; september 1297 – sekitar tahun 1371) merupakan seorang bangsawati Inggris. Dia adalah putri , Baron pertama Monthermer dan istrinya . Sumber-sumber lain membuatnya lahir pada tahun 1298. (in)