The Official Christianisation of the Roman Empire
This essay examines the various events proposed as Christianity’s official proclamation as the Roman Empire’s state religion: the alleged edict of Milan by Emperor Constantine (305–337) in 313, the first Ecumenical Council celebrated in Nicaea in 325, and the edict issued by Emperor Theodosius I (379–395) in Thessalonica on 28 February 380 (CTh 16:1.2). On the basis of analyses of historical and literary sources, it will be demonstrated that it was the first Ecumenical Council that transformed the pagan Roman empire into a Christian one. The essay also analyses the Christianisation of the peoples outside the Roman Empire in the first centuries after Christ. It will be shown that, while the Christianisation of the Roman Empire was a gradual process, interspersed with temporary restorations of paganism, the proclamation of the faith in Christ as a state religion elsewhere has been recounted by historical sources as the result of a miracle that did not leave space for second thoughts. This means that, while the imperial ruling class gradually became Christian, the ruling classes of all other kingdoms followed their own personal feelings and socio-political opportunism, culminating in a precise political and cultural choice to align themselves with the most powerful Christian state. No state or country became Christian before the Roman Empire did.