XLVI THE CRUSADES AND THE AGE OF PAPAL DOMINION It is interesting to note that Charlemagne corresponded with the Caliph Haroun-al-Raschid, the Haroun-al-Raschid of the Arabian Nights. It is recorded that Haroun-al-Raschid sent ambassadors from Bagdad—which had now replaced Damascus as the Moslem capital—with a splendid tent, a water clock, an elephant and the keys of the Holy Sepulchre. This latter present was admirably calculated to set the Byzantine Empire and this new Holy Roman Empire by the ears as to which was the proper protector of the Christians in Jerusalem. These presents remind us that while Europe in the