The Cambridge Medieval History, vol. II, will cover the entire period and give ample bibliographical references.
Chapter I. The Church In The Eastern Empire
The century extending from the accession of Justin I (518-528) to the end of the Persian wars of Heraclius (610-641), or from 518 to 628, is the most brilliant period of the Eastern Empire. The rise of Islam had not yet taken place, whereby the best provinces in Asia and Africa were cut off from the Empire. A large part of the West was recovered under Justinian, and under Heraclius the power of Persia, the ancient enemy of the Roman Empire, which had been a menace since the latter part of the third century, was completely overthrown in the most brilliant series of campaigns since the foundation of the Roman Empire. With the death of Justin II (565-578), the family of Justin came to an end after occupying the throne for sixty years. But under Tiberius (578-582) and Maurice (582-602) the policy of Justinian was continued in all essentials in the stereotyped form known as Byzantinism. The Church became practically a department of the State and of the political machinery. The only limitation upon the will of the Emperor was the determined resistance of the Monophysites and smaller factions. Maurice was succeeded by the rude Phocas (602-610), whom a military revolution placed upon the throne, and who instituted a reign of terror and blood. Upon his downfall, Heraclius (610-641) ascended the throne.
§ 93. The Age of Justinian
Justinian I, the greatest of all the rulers of the Eastern Empire, succeeded his uncle Justin I (518-527); but he had, from the beginning of the latter's reign, exercised an ever-increasing influence over the imperial policy, and to him can be attributed the direction of ecclesiastical affairs from the accession of Justin. No reign among the Eastern emperors was more filled with important events and successful undertakings. His first great work was the reduction of the vast mass of Roman law to what approached a system. This was accomplished in 534, resulting in the Digest, made up of the various decisions and opinions of the most celebrated Roman legal authorities, the Codex, comprising all the statute law then in actual force and applicable to the conditions of the Empire, and the Institutes, a revision of the excellent introductory manual of Gaius. No body of law reduced to writing has been more influential in the history of the world. The second great undertaking, or series of undertakings, was the reconquest of the West. In 533 Belisarius recovered North Africa to the Empire by the overthrow of the Vandal kingdom. In 554 the conquest of Italy by Belisarius and Narses was completed. Portions of Spain had also been recovered. No Eastern Emperor ruled over a larger territory than did Justinian at the time of his death. The third great line of work on the part of Justinian was his regulation of ecclesiastical and theological matters. In this he took an active personal part. The end of the schism with the West had been brought about under the reign of his uncle. Three controversies fill the reign of Justinian: the Theopaschite (519-533) over the introduction of the phrase into the Trisagion, stating that God was crucified for us, so that the Trisagion read as follows, [pg 542] “Holy God, Holy Mighty, Holy Immortal, who was crucified for us, have mercy upon us”; the Second Origenistic controversy (531-543) in which those elements of Origen's teaching which had never been accepted by the Church were condemned along with Origen himself; and the Three Chapters controversy, 544-553, in which, as an attempt to win back the Monophysites, which began even before the Conference with the Severians in 533, three of the leading Antiochians were condemned. In connection with the two last controversies, the Fifth General Council was held A. D. 553.
Additional source material: Evagrius, Hist. Ec., Lib. IV-VI; John of Ephesus, The Third Part of His Ecclesiastical History, trans. by R. Payne Smith, Oxford, 1860; Percival, Seven Ecumenical Councils (PNF).
(a) Justinian, Anathematisms against Origen. Mansi, IX, 533. (MSG, 86:1013; MSL, 65:221.)
The Origenistic controversy arose in Palestine, where the learned monks were nicknamed Origenists by the more ignorant. The abbot St. Sabas was especially opposed to the group which had received this name. But several, among whom the more important were Domitian and Theodore Askidas, won the favor of Justinian and the latter received promotion, becoming bishop of Cæsarea in Cappadocia. Supported by them, struggles broke out in various places between the Sabaites and the Origenists. Ephraem, patriarch of Antioch, in a synodal letter thereupon condemned Origenism. The Origenists tried in vain to win the support of John, patriarch of Constantinople. But he turned to Justinian, who thereupon abandoned the Origenists and issued an edict condemning Origen and his writings, and appending a summary of the positions condemned in ten anathematisms. Text in Denziger, nn. 203 f. Synods were ordered for the condemnation of Origen, and among these was the synod under Menas, patriarch of Constantinople, in which were issued fifteen anathematisms based upon the ten of Justinian (Hefele, §§ 257, 258). With this action, the controversy may be said to be closed, were it not that in spite of the renewed condemnation at the Fifth General Council (see below) disputes and disturbances continued in Palestine until 563.