The whole Byzantine intellectual life, like that of the Western medieval period, is dominated by theological interests. Theology accordingly, in literature too, occupies the chief place, in regard to both quantity and quality. Next to it comes the writing of history, which the Byzantines cultivated with great conscientiousness until after the fall of the empire. All other kinds of prose writing, e.g. in geography, philosophy, rhetoric and the technical sciences, were comparatively neglected, and such works are of value for the most part only in so far as they preserve and interpret old material. In poetry, again, theology takes the lead. The poetry of the Church produced works of high aesthetic merit and enduring value. In secular poetry, the writing of epigrams especially was cultivated with assiduity and often with ability. In popular literature poetry predominates, and many productions worthy of notice, new both in matter and in form, are here met with. Theology. The great classical period of Greek theological literature is that of the 4th century. Various factors contributed to this result--some of them positive, particularly the establishment of Christianity as the official religion and the protection accorded to it by the state, others negative, i.e. the heretical movements, especially Arianism, which at this period arose in the east of the empire and threatened the unity of the doctrine and organization of the church. It was chiefly against these that the subtle Athanasius of Alexandria directed his attacks. The learned Eusebius founded a new department of literature, church history. In Egypt, Antonius (St Anthony) founded the Greek monastic system; Synesius of Cyrene, like his greater contemporary Augustine in the West, represents both in his life and in his writings the difficult transition from Plato to Christ. At the centre, in the forefront of the great intellectual movement of this century, stand the three great Cappadocians, Basil the Great, the subtle dogmatist, his brother Gregory of Nyssa, the philosophically trained defender of the Christian faith, and Gregory of Nazianzus, the distinguished orator and poet. Closely allied to them was St Chrysostom, the courageous champion of ecclesiastical liberty and of moral purity. To modern readers the greater part of this literature appears strange and foreign; but, in order to be appreciated rightly, it must be regarded as the outcome of the period in which it was produced, a period stirred to its depths by religious emotions. For the times in which they lived and for their readers, the Greek fathers reached the highest attainable; though, of course, they produced nothing of such general human interest, nothing so deep and true, as the _Confessions_ of St Augustine, with which the poetical autobiography of Gregory of Nazianzus cannot for a moment be compared.