the work, starting from the praise to theophileis emperors Constantine and Licinius as contained in the speech for the inauguration of the basilica of Tyre in the book X of the Ecclesiastical History of Eusebius of Caesarea, and from the titles of the chapters of the book IX, which can be attributed to Eusebius himself, aims to suggest that the narrative of the book IX was originally marked by a substantial balance between the two emperors. The obvious imbalances in the text that we possess in favor of Constantine can be attributed to the edition of the work after the final victory of Constantine over Licinius, bearing in mind that Eusebius was a bishop in the pars of Licinius and that he himself does not attest any conflict with the 'emperor