article: List of grand masters of the Knights Hospitaller
links: Rome Saint Petersburg Marco Luzzago Fourth Crusade Alexander I of Russia Messina Cyprus Pope Pius VII Pope Paschal II Pope Leo XIII Ferrara Pope John XXIII Catania Ludwig Hoffmann-Rumerstein Giacomo dalla Torre del Tempio di Sanguinetto Siege of Jerusalem (1187) Matthew Festing Sovereign Military Order of Malta Fifth Crusade Knights Hospitaller Sixth Crusade