Mary Gwendolin Caldwell, Marquise des Monstiers-Mérinville

Mary Gwendolin Caldwell
Marquise des Monstiers-Mérinville
Likeness printed in the Mexico Missouri Message in 1904.
BornMary Gwendolin Byrd Caldwell
October 21, 1863
Louisville, Kentucky, U.S.
DiedAugust 5, 1909 (aged 45)
New York Harbor, New York, U.S.
BuriedCave Hill Cemetery
Spouse
François Jean Louis, Marquis des Monstiers-Mérinville
(m. 1896)
FatherWilliam S. Caldwell

Mary Gwendolin Byrd, Marquise des Monstiers-Mérinville (née Caldwell; 1863–1909) 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.