The Order of Our Lady of Ransom, also known as the Mercedarians, is a Catholic religious order founded in 1218 by Saint Peter Nolasco in Barcelona, Spain. Its primary mission is to rescue Christians who have been captured and enslaved by non-Christians, particularly during the Middle Ages. The order emphasizes the importance of charity and the redemption of captives. Members of the order take a special vow to offer themselves as hostages if necessary to secure the release of those imprisoned for their faith. The Mercedarians are dedicated to promoting peace and justice, and they continue their work today through various charitable activities and missions around the world.