A note for anyone else following this thread:
@muhammad_isa has made comments that could be read to imply there was a degree of violence and bloodshed between disputants over the Arian controversy, or around the Trinitarian doctrine. This is a somewhat fanciful exaggeration.
In 313AD Arius nominated himself to become Bishop of Alexandria, but Alexander was chosen instead. Alexander was happy to have Arius continue in his role as presbyter, until the dispute broke out. It was very much a 'war of words', with letters flying back and forth as both sides sought the support of the wider church in settling the dispute.
Constantine, who had just taken possession of the eastern half of the empire, unifying it once more under his sole command, was rather disconcerted to find a dispute in full swing. Unable to dampen it down, he called a council. The outcome of Nicea was
the exile of Arius and five others. That's it. No witch-hunts, no purges. Within a couple of years, the exiles had been forgiven and invited home.
Theological debate was mainly about the divinity of the Son, however, because Nicaea had not clarified the divinity of the Holy Spirit, the Third Person of the Trinity, He too became a topic of debate.
Theodosius became sole emperor in 380AD, and began a campaign to bring the Eastern Church back to Nicene Christianity, with Constantinople solidly Arian. To complicate matters, there were disagreements among the Nicenes, 'almost to the point of complete animosity' centred on the schools of Alexandria and Antioch.
On his accession to the imperial throne, Theodosius offered to confirm Demophilus as bishop of the imperial city on the condition of his accepting the Nicene Creed. Demophilus refused, and was ordered to give up his churches and leave Constantinople. Arians were dismissed from their churches in other Eastern cities, thus re-establishing Nicene orthodoxy in the East.
Throughout this period, I'm not sure there was
any bloodshed over Arianism or the Trinity whatsoever ... might be wrong, but a quick glance of various sources offers nothing.