What did Constantine learn in 325? Constantine’s theological declarations before, at and after Nicaea

Abstract

The analysis of the corpus of letters of the emperor Constantine, in particular, the one he addressed to the synod of Arles in 314, the one he addressed to the Church of Nicomedia in 325 and the one he addressed to Arius in 333, and of Eusebius of Caesarea’s account of the Synod of Nicaea in 325, allows to evaluate the evolution of the theological representations of the first Christian emperor. Constantine’s interest was not only political, but he also was able to listen to and understand the theological milestones of the controversy.