Please do not take offence at my question but for the life of me I cannot pin point where I read or heard the statement that the Roman Empire came up with the idea of Trinity to stop fighting between different Christian factions on the nature of God. Is this true? If not, when and how was the idea of Trinity introduced?
I found it
A classic example of this was the dispute over the nature of Christ that led the Roman emperor Constantine the Great to convene the Council of Nicaea (in modern-day western Turkey) in A.D. 325.
Constantine, although held by many to be the first “Christian” Roman Emperor, was actually a sun-worshiper who was only baptized on his deathbed. During his reign he had his eldest son and his wife murdered. He was also vehemently anti-Semitic, referring in one of his edicts to “the detestable Jewish crowd” and “the customs of these most wicked men”—customs that were in fact rooted in the Bible and practiced by Jesus and the apostles.
As emperor in a period of great tumult within the Roman Empire, Constantine was challenged with keeping the empire unified. He recognized the value of religion in uniting his empire. This was, in fact, one of his primary motivations in accepting and sanctioning the “Christian” religion (which, by this time, had drifted far from the teachings of Jesus Christ and the apostles and was Christian in name only).
But now Constantine faced a new challenge. Religion researcher Karen Armstrong explains in A History of God that “one of the first problems that had to be solved was the doctrine of God . . . a new danger arose from within which split Christians into bitterly warring camps” (1993, p. 106).