of the Faith by a thorough investigation of controverted matters. Justinian first thought out vexed questions for himself, and then endeavoured to make others think them out. From 527, in the East, Church history may be said to start on new lines. The Catholic definition was completed and the imperial power was definitely committed to it. We may now look at the Orthodox Church as one, united against outside error. {12} A period of critical interest in the history of Europe is that to which belongs the difficult and complicated Church history of the East from the accession of the Emperor Justinian to the death of S. Methodius. The period naturally divides itself into three parts--the first, from 527 to 628, dealing with the Church at the height of its authority, up to the overthrow of the Persian power; the second to 725, the period up to the beginning of the iconoclastic controversy; and the third up to its close and the death of S. Methodius in 847. With the first we will deal in the present chapter. [Sidenote: Church and State in the East.] But throughout the whole three centuries, from 527 to 847, the essential character of the Church's life in the east is the same. In the East the Church was regarded more decisively than in the West as the complement of the State. Constantine had taught men to look for the officials of the Church side by side with those of the civil power. At Constantinople was the centre of an official Christianity, which recognised the powers that be as ordained of God in a way which was never found at Rome. At Rome the bishops came to be political leaders, to plot against governments, to found a political power of their own. At Constantinople the patriarchs, recognised as such by the Emperor and Senate of the New Rome, sought not to intrude themselves into a sphere outside their religious calling, but developed their claims, in their own sphere, side by side with those of the State; and their example was followed in the Churches which began to look to Constantinople for guidance. There was a necessary consequence of this. {13} [Sidenote: Nationalism of the Churches.] It was that when the nationalities of the East,--in Egypt, Syria, Armenia, or even in Mesopotamia--began to resent the rule of the Empire, and struggled to express a patriotism of their own, they sought to express it also on the ecclesiastical side, in revolt from the Church which ruled as a complement to the civil power. Heresy came to be a sort of patriotism in religion. And while there was this of evil, it was not evil that each new barbarian nation, as it accepted the faith, sought to set up beside its own sovereign its patriarch also. "Imperium," they said, "sine patriarcha non staret," an adage which James I. of England inverted when he said, "No bishop, no king." Though the Bulgarians agreed with the Church of Constantinople in dogmas, they would not submit to its jurisdiction.