Book 7 — Chapter 21 - Events at Alexandria
Book VII follows Dionysius of Alexandria through disputes over washing converts, Valerian's persecution, Gallienus's peace, the Apocalypse debate, Paulos of Samosata, and the emergence of the Manichaean movement. 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 7, Chapter 21, and the full subject is retained under the heading 'Events at Alexandria'. Names, dates, quoted-source relationships, and political or textual function are kept distinct from Eusebius's own interpretive claims.