Knights of St. John
The Knights of St. John, also known as the Knights Hospitaller were a medieval military order. They originally cared for sick and wounded pilgrims, but gradually developed, and became an autonomous order dedicated to fighting Muslims in the Crusades. After the Holy Land was conquered my the Muslims, they relocated to Rhodes, and eventually to Malta, over which they ruled.
Today, the order survives in the form of the Sovereign Military Hospitaller Order of Saint John of Jerusalem, of Rhodes, and of Malta.