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Cardinal Angelo Mai published the text from Vaticanus graecus 1611, fols. 277a–278b in Patrum Nova Bibliotheca / Novae Patrum Bibliothecae 4. Eusebius composed what he calls ‘a mystical explanation of the festival’ of Easter, had it translated into Latin and sent it to Constantine. Its purpose seems to be to justify Eusebius’ acceptance of the Nicene decisions concerning the date of Easter. Mai's text was reprinted together with the Latin translation which he provided en face by the Abbé Migne in Patrologia Graeca 24. Modern discussions of the Nicene decisions relating to Easter make little or no use of Eusebius’ tract, while significant details in the text have sometimes been overlooked even by the most critical. This chapter offers an English translation of Mai's text with some minor corrections, which are noted together with Migne's deviations from Mai.