A Knight of St. John
It takes its origins from the Knights Hospitaller, an organization founded in Jerusalem in 1050 as an Amalfitan hospital to provide care for poor and sick pilgrims to the Holy Land. After the conquest of Jerusalem in 1099 during the First Crusade, it became a Catholic military order under its own charter. Following the loss of Christian territory to Islamic conquerors of the Holy Land, the Order operated from Rhodes (1310-1523), and later from Malta (1530-1798), over which it was sovereign.
Rev. C. Arthur Lane Illustrated Notes on English Church History (London: Society for Promoting Christian Knowledge, 1901)