The story of Eastern Christendom is unique. There is the fascinating tale of the union of Greek metaphysics and Christian theology, and its results, so fertile, so vigorous, so intensely interesting as logical processes, so critical as problems of thought. For the historian there is a story of almost unmatched attraction; the story of how a people was kept together in power, in decay, in failure, in persecution, by the unifying force of a Creed and a Church. And there is the extraordinary missionary development traceable all through the history of Eastern Christianity: the wonderful Nestorian missions, the activity of the evangelists, imperial and hierarchical, of the sixth century, the conversion of Russia, the preludes to the remarkable achievements in modern times of orthodox missions in the Far East. Throughout the whole of the long period indeed {7} which begins with the death of Leo and ends with that of Silvester II., though the Latin Church was growing in power and in missionary success, it was probably the Christianity of the East which was the most secure and the most prominent. Something of its work may well be told at the beginning of our task. [Sidenote: The Monophysite controversy.] The last years of the fifth century were in the main occupied in the East by the dying down of a controversy which had rent the Church. The Eutychian heresy, condemned at Chalcedon, gave birth to the Monophysite party, which spread widely over the East. Attempts were soon made to bridge over the gulf by taking from the decisions of Chalcedon all that definitely repudiated the Monophysite opinions. [Sidenote: The Henotikon.] In 482 the patriarch Acacius of Constantinople, under the orders probably of the Emperor Zeno (474-91), drew up the _Henotikon_, an endeavour to secure the peace of the Church by abandoning the definitions of the Fourth General Council. No longer was "one and the same Christ, Son, Lord, only-begotten, acknowledged _in two natures_, without fusion, without change, without division, without separation." But it is impossible to ignore a controversy which has been a cause of wide divergence. Men will not be silent, or forget, when they are told. Statesmanlike was, no doubt, the policy which sought for unity by ignoring differences; and peace was to some extent secured in the East so long as Zeno and his successor Anastasius (491-518) reigned. But at Rome it was not accepted. Such a document, which implicitly repudiated the language of Leo the Great, which the Fourth General Council had adopted, could {8} never be accepted by the whole Church; and those in the East who were theologians and philosophers rather than statesmen saw that the question once raised must be finally settled in the dogmatic decisions of the Church. Had the Lord two Natures, the Divine and Human, or but one? The reality of the Lord's Humanity as well as of His Divinity was a truth which, at whatever cost of division