This is the first English translation of the last two theological works of Eusebius of Caesarea, Against Marcellus and On Ecclesiastical Theology. The first text was composed after the deposition of Marcellus of Ancyra in 336 to justify the action of the council fathers in ordering the deposition on the grounds of heresy, contending that Marcellus was “Sabellian” (or modalist) on the Trinity and a follower of Paul of Samosata (hence adoptionist) in Christology. Relying heavily upon extensive quotations from a treatise Marcellus wrote against Asterius the Sophist, this text provides important information about ecclesiastical politics in the period before and just after the Council of Nicea, and endeavors to demonstrate Marcellus’s erroneous interpretation of several key biblical passages that had been under discussion since before the council. In doing so, Eusebius criticizes Marcellus’s inadequate account of the distinction between the persons of the Trinity, eschatology, and the Church’s teaching about the divine and human identities of Christ.

On Ecclesiastical Theology, composed circa 338/339 just before Eusebius’s death, and perhaps in response to the amnesty for deposed bishops enacted by Constantius after the death of Constantine in 377 and the possibility of Marcellus’s return to his see, continues to lay out the criticisms initially put forward in Against Marcellus, again utilizing quotations from Marcellus’s book against Asterius. However, we see in this text a much more systematic explanation of Eusebius’s objections to the various elements of Marcellus’s theology and what he sees as the proper orthodox articulation of those elements.

Long overlooked for statements at odds with later orthodoxy, even written off as heretical because allegedly “semi-Arian,” recent scholarship has demonstrated the tremendous influence these texts had on the Greek theological tradition in the fourth century, especially on the orthodox understanding of the Trinity. In addition to their influence, they are some of the few complete texts that we have from Greek theologians in the immediate period following the Council of Nicea in 325, thus filling a gap in the materials available for research and teaching in this critical phase of theological development.

When early Christians began to study the Bible, and to write their own history and that of the Jews whom they claimed to supersede, they used scholarly methods invented by the librarians and literary critics of Hellenistic Alexandria. But Origen and Eusebius, two scholars of late Roman Caesarea, did far more. Both produced new kinds of books, in which parallel columns made possible critical comparisons previously unenvisioned, whether between biblical texts or between national histories. Eusebius went even farther, creating new research tools, new forms of history and polemic, and a new kind of library to support both research and book production.

Christianity and the Transformation of the Book combines broad-gauged synthesis and close textual analysis to reconstruct the kinds of books and the ways of organizing scholarly inquiry and collaboration among the Christians of Caesarea, on the coast of Roman Palestine. The book explores the dialectical relationship between intellectual history and the history of the book, even as it expands our understanding of early Christian scholarship. Christianity and the Transformation of the Book attends to the social, religious, intellectual, and institutional contexts within which Origen and Eusebius worked, as well as the details of their scholarly practices--practices that, the authors argue, continued to define major sectors of Christian learning for almost two millennia and are, in many ways, still with us today.,

This study of the Roman Empire in the age of Constantine offers a thoroughly new assessment of the part Christianity played in the Roman world of the third and fourth centuries.

Timothy D. Barnes gives the fullest available narrative history of the reigns of Diocletian and Constantine. He analyzes Constantine’s rise to power and his government, demonstrating how Constantine’s sincere adherence to Christianity advanced his political aims. He explores the whole range of Eusebius’ writings, especially those composed before Constantine became emperor, and shows that many attitudes usually deemed typical of the “Constantinian revolution” were prevalent before the new Christian empire came into existence. This authoritative political and cultural history of the age of Constantine will prove essential to students and historians of the ancient world.

Eusebius of Caesarea was one of the most significant and voluminous contributors to the development of late antique literary culture. Despite his significance, Eusebius has tended to receive attention more as a source for histories of early Christianity and the Constantinian empire than as a writer and thinker in his own right. He was a compiler and copyist of pagan and Christian texts, collator of a massive chronographical work, commentator on scriptural texts, author of apologetic, historical, educational, and biographical works, and custodian of one of the greatest libraries in the ancient world. As such, Eusebius merits a primary place in our appreciation of the literary culture of late antiquity for both his self-conscious conveyance of multiple traditions and his fostering of innovative literary and intellectual trajectories. By focusing on the full range of Eusebius’s literary corpus, the collection of essays in Eusebius of Caesarea offers new and innovative studies that will change the ways classicists, theologians, and ancient historians think about this major figure.