Order of the Blessed Virgin Mary of Mercy

The Royal, Celestial and Military Order of Our Lady of Mercy and the Redemption of the Captives (Latin: Ordo Beatae Mariae de Mercede Redemptionis Captivorum, abbreviated O. de M.), also known as the Mercedarians, is a Catholic mendicant order established in 1218 by Peter Nolasco in the city of Barcelona, at that time the capital of the Principality of Catalonia, part of the Crown of Aragon, for the redemption of Christian captives. Its members are most commonly known as Mercedarian friars or nuns.

Source: Wikipedia — Order of the Blessed Virgin Mary of Mercy (CC BY-SA 4.0)