Among the earlier events which contributed to make the Roman belief the standard for all Western Christendom we need only mention the conquests of the orthodox Frankish monarchy; the official conversions from Arianism of the Burgundians (516) and the Visigoths in Spain (586); the extirpation of the Vandals and Ostrogoths by Justinian's generals; the missions of Augustine to England, of Wilfrid, Willibrord, and Boniface to the Germans; the submission of the Frankish Church under the influence of Boniface and Pepin the Short (748). Naturally the moral influence of Rome in the northern lands was augmented by the revival of the Western Empire, which meant the co-operation of Pope and Emperor in the extension of the Christian Republic. Cyril and Methodius, the Apostles of the Slavs, found it necessary to renounce the allegiance of the Greek Church, and to place their converts under the protection of Rome (866). It was from Rome that St. Adalbert went forth on his ill-starred but glorious mission to the Prussians (997); and it was a Pope, Sylvester II, who earned the glory of uniting the Hungarian people to Western Christendom (1000). Finally, Canute the Great, of Denmark and of England, came in the manner of a pilgrim (1027) to lay the homage of his Scandinavian subjects on the altar of St. Peter. The Popes reaped where they had not sown; but the harvest was rich and splendid. No less important was the political character which the papal office assumed with the revival of the Empire. Already under Gregory the Great we can trace the beginnings of a temporal power. Naturally and necessarily the Pope, already like other bishops a functionary charged with important secular duties, took upon himself the protection and government of Rome and the surrounding duchy, when the rulers of Byzantium shook off these unprofitable responsibilities. Naturally and excusably he claimed, over his vast Italian estates, the powers of jurisdiction which every landowner was assuming as a measure of self-defence against oppression or unbridled anarchy. In the time of Pepin the Short a further step was taken. The Frank, unwilling to involve himself in Italy yet anxious to secure the Holy See against the Lombards, recognized Pope Stephen II as the lawful heir of the derelict imperial possessions. And Charles the Great, both as King and as Emperor, confirmed the donation of his father. To make the Pope an independent sovereign was indeed a policy which he refused to entertain. His ideal was that of the Eastern Emperors: himself as the head of State and Church, the Pope as the Patriarch of all the churches in the Empire, elected with the Emperor's approval, ruling the clergy with the Emperor's counsel, enjoying over the lands of his see the largest privileges bestowed on any bishop, but still in all secular affairs a subject of the Empire. But on the other hand arose at Rome a different conception of the Pope's prerogative. Long ago Pope Gelasius had