Eusebius 
The Ecclesiastical History 
Complete 10 Book Edition: The Early Christianity: From A.D. 1-324

The Ecclesiastical History by Eusebius, the bishop of Caesarea, was a 4th-century pioneer work giving a chronological account of the development of Early Christianity from the 1st century to the 4th century. It was written in Koine Greek, and survives also in Latin, Syriac and Armenian manuscripts. Eusebius had access to the Theological Library of Caesarea and made use of many ecclesiastical monuments and documents, acts of the martyrs, letters, extracts from earlier Christian writings, lists of bishops, and similar sources, often quoting the originals at great length so that his work contains materials not elsewhere preserved. The result was the first full-length historical narrative written from a Christian point of view.