Book 5 — Chapter 15 - The Separation of Blastus at Rome
Book V centers on the persecution in Lugdunum and Vienna, Irenaeus, the Phrygian prophetic movement, Roman successions, and the major dispute over the date of Pesach. He synchronizes local leadership with imperial reigns, using successions at Rome, Alexandria, Antioch, and Yerushalayim as chronological anchors. These notices are institutional claims from his sources, not proof that every later title or jurisdiction existed in identical form from the beginning. In this reconstruction the chapter coordinate is preserved as Book 5, Chapter 15, and the full subject is retained under the heading 'The Separation of Blastus at Rome'. Names, dates, quoted-source relationships, and political or textual function are kept distinct from Eusebius's own interpretive claims.