Eusebius’ Ecclesiastical History is important as a witness to Apostolic Succession. Composition began around 311, and 4 versions were issued. The final version of the text appeared soon after the fall of Licinius in 323.
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. (Wikipedia).
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