Mary Gwendolin Byrd, Marquise des Monstiers-Mérinville was an American philanthropist and socialite. She funded the foundation of the Catholic University at Washington, D.C. in the 1880s, but had renounced the Roman Catholic faith by 1904.
- Occupation
- philanthropist, socialite
- Citizenship
- United States
- Born
- October 21, 1863, 1863
- Died
- October 5, 1909, 1909
