the first foundations of christian dogma were not laid by force of theological debate or in any community peace. the apparatus of roman power thought otherwise. in the summer of 325, constantine gathered some 250-300 bishops — tradition would later fix the canonical figure at 318 — in the city of nicaea, summoned them to his palace and demanded they leave with a single common creed, whatever the cost.
let us start with the date, which deserves honesty. tradition places the opening of the council on 20 may 325, but the sources are not unanimous: the solemn sessions did not begin until 14 june, with the arrival of the emperor, and the creed was not fixed until 19 june. the exact dating of the first day is disputed; what is firm is the year and the magnitude of the event. it was the first ecumenical council, the first that claimed to speak in the name of all christendom at once.
the problem that drove it was theological on the surface and political at its core. a presbyter from alexandria, arius, held that christ, the son, was a creature created by the father and therefore subordinate to him; his rivals argued he was fully divine and co-eternal. the dispute had set the christian communities of the east ablaze, just emerged from persecution and finally protected by the state, splitting them into factions that excommunicated each other. the faith constantine had chosen as the mortar of his empire threatened to crack into pieces.
doctrine had to bend to the order of the empire, not the order of the empire to doctrine.
and constantine cared little for the nuances of christ’s nature. his gaze was that of a soldier: he saw that this faction war was undermining public order, the supply of the empire and the loyalty of the eastern provinces, the richest and most christianised. a divided church was a divided empire. so he summoned the bishops of the entire known world, paid for their journey through the state post system, gathered them in his residence as guests of honour. the emperor, who was technically not even baptised, presided in person over the sessions of a christian council.
the imperial demand was uncompromising: the assembly was to consolidate its criteria in an immovable document. out of it came the nicene creed, which declared the son “of the same substance” as the father, homooúsios, a technical word that closed the door on arianism. and it was sealed by reason of state, not of faith: whoever refused to join the consensus would face exile. arius and a couple of irreducible bishops were exiled, their writings condemned to the fire. dissent was punished by exile.
that said, it is worth not caricaturing. nicaea did not impose unity in one stroke: the arian controversy lived on for decades, later emperors leaned the other way, and constantine himself would end up rehabilitating arius in 327 and dying baptised, precisely, by a bishop of the faction close to arianism, eusebius of nicomedia. the council did not settle the theology; what it inaugurated was a decisive precedent: political power deciding, through coercion, what was orthodoxy and what was heresy. from that day on it was established that in the christian empire correct doctrine would be, above all, whatever suited the order of the state.
