The Order of Knights of the Hospital of Saint John of Jerusalem, commonly known as the Knights Hospitaller, the Knights of Rhodes, the Knights of Malta, or the Order of Saint John or even the Knights of St. John, was a medieval and early modern Catholic military order. It was headquartered in the Kingdom of Jerusalem until 1291, on the island of Rhodes from 1310 until 1522, in Malta from 1530 until 1798 and at Saint Petersburg from 1799 until 1801. Today several organizations continue the Hospitaller tradition, specifically the mutually recognised orders of St. John which are the Sovereign Military Order of Malta, the Most Venerable Order of the Hospital of St. John, the Johanniterorden, the Johanniter Orde in Nederland, the Johanniterorden i Sverige.
