The Order of St. John, also known as the Knights Hospitaller, is a medieval Catholic military order founded in the 11th century. Initially established to provide care for sick and injured pilgrims in the Holy Land, the order evolved into a military force that defended Christian territories during the Crusades. Over the centuries, the order expanded its mission to include humanitarian efforts and medical care. Today, the Sovereign Military Order of Malta, a modern successor of the original order, focuses on charitable activities and international diplomacy, continuing the legacy of service and care initiated by the Order of St. John.