Their purpose was but half accomplished. They could create but they could not destroy: they set up an Emperor of their own, whose representatives thenceforward ruled the West, but Constantinople retained her sovereigns as of yore; and Christendom saw henceforth two imperial lines, not as in the time before A.D. 476, the conjoint heads of a single realm, but rivals and enemies, each denouncing the other as an impostor, each professing to be the only true and lawful head of the Christian Church and people. Although therefore we must in practice speak during the next seven centuries (down till A.D. 1453, when Constantinople fell before the Mohammedan) of an Eastern and a Western Empire, the phrase is in strictness incorrect, and was one which either court ought to have repudiated. The Byzantines always did repudiate it; the Latins usually; although, yielding to facts, they sometimes condescended to employ it themselves. But their theory was always the same. Charles was held to be the legitimate successor, not of Romulus Augustulus, but of Basil, Heraclius, Justinian, Arcadius, and all the Eastern line; and hence it is that in all the annals of the time and of many succeeding centuries, the name of Constantine VI, the sixty-seventh in order from Augustus, is followed without a break by that of Charles, the sixty-eighth. [Sidenote: Government of Charles as Emperor.] [Sidenote: His authority in matters ecclesiastical.] The maintenance of an imperial line among the Greeks was a continuing protest against the validity of Charles's title. But from their enmity he had little to fear, and in the eyes of the world he seemed to step into their place, adding the traditional dignity which had been theirs to the power that he already enjoyed. North Italy and Rome ceased for ever to own the supremacy of Byzantium; and while the Eastern princes paid a shameful tribute to the Mussulman, the Frankish Emperor--as the recognised head of Christendom--received from the patriarch of Jerusalem the keys of the Holy Sepulchre and the banner of Calvary; the gift of the Sepulchre itself, says Eginhard, from Aaron king of the Persians[70]. Out of this peaceful intercourse with the great Khalif the romancers created a crusade. Within his own dominions his sway assumed a more sacred character. Already had his unwearied and comprehensive activity made him throughout his reign an ecclesiastical no less than a civil ruler, summoning and sitting in councils, examining and appointing bishops, settling by capitularies the smallest points of church discipline and polity. A synod held at Frankfort in A.D. 794 condemned the decrees of the second council of Nicæa, which had been approved by Pope Hadrian, censured in violent terms the conduct of the Byzantine rulers in suggesting them, and without excluding images from churches, altogether forbade them to be worshipped or even venerated. Not only did Charles preside in and