It amazes me how many Nicea myths exist on the internet today.
We are going to address three. These are fables. They did not happen. I'm going to show you how you can know that.
We don't really have to address the second of these Nicea Myths thoroughly, since I already have a page on the subject. We will give a brief, shortened explanation below.
The only way to to know what really went on at Nicea is to know ...
There is a lot of primary material (see sidebar below) left from the Council of Nicea:
In other words, we know exactly what the council addressed.
They did not address the following Nicea Myths.
The Council of Nicea never addressed the books of the Bible (and thus could not have changed them).
It's just not there.
Proving something negative is always tricky. I can't show you a quote where someone from the 4th century said, "Oh, by the way, we didn't talk about the books of the Bible." You'll have to take my word—and the word of every reputable historian in history—that it's never mentioned.
Or you can go through all the sources listed above, as I did. That they threw out or even talked about the canon is one of many Nicea myths.
Of course, they really didn't have a "Bible" yet, anyway. Their Scriptures were a collection of books, and which books were accepted varied from church to church, though only over a few books, none of them gnostic (like the Gospel of Thomas or the Pistis Sophia).
This fable stems from the fact that there was a controversy over the celebration of Passover in the early church.
The early church celebrated the Jewish Passover, which occurred on Nisan 14 by their calendar. Nisan 14 could fall on any day of the week, so some churches liked to celebrate Passover on the Sunday nearest Nisan 14.
That "Quartodeciman Controversy," as it was called, hit some high points in the 2nd century. Around A.D. 150, when Polycarp, the venerable bishop of Smyrna, was quite old, he went to Rome to discuss this issue with Anicetus. They decided that each church would continue to celebrate Passover according to their own traditions, as each had received different traditions from their respective apostles (from a letter from Irenaeus, bishop of Lyons, to Victor, bishop of Rome, preserved in Eusebius' Ecclesiastical History V:24, A.D. 323).
A generation later, Victor, the bishop of Rome, decided to excommunicate any church that did not celebrate Passover on Sunday. Irenaeus and another bishop, Polycrates, wrote Victor to help him recover from this insanity. Once again, the issue was settled with each church continuing their respective tradition.
One thing among Nicea myths is that Constantine remained the high priest of the pagan religion until his deathbed (Re: Philip Schaff's History of the Christian Church). At that time, he retired from being emperor, renounced his position as leader of the pagan religion, and was baptized as a Christian.
So it is true that Constantine had reason to honor the 1st day of the week as the day of the sun.
However, Christians had already been celebrating the first day of the week as the Lord's day since apostolic times:
So you see it is apparent that Constantine did not need to change the Sabbath to Sunday. In fact, Christians had a quite different view of the role of the Sabbath in the Christian life.
It's December of 2010 as I write this, and every day someone is blogging that St. Nicholas slapped Arius at the Council of Nicea. I was astonished at how much this was being written because I've looked at all the primary documents, and I'd never seen St. Nicholas mentioned.
As it turns out, that's because he's not.
I'm not as familiar with Medieval Christianity as I am with the rest of Christian history, so I was grateful to find an article at Christianity Today's Christian History section, one of the more reliable sources available on the internet. Usually, their articles are written by actual historians whose credentials are given, though in this case only the writer's name is given. (I am a paid subscriber to their Christian History, and I would recommend that to anyone interested in church history; it's very inexpensive.)
Their article explains that it's only five centuries after Nicea that St. Nicholas is first mentioned. The author's conclusion is, "This should be taken as fantasy because there are pretty good records of the council, and Nicholas isn't mentioned."
I'm grateful for his help, but you and I could have safely concluded the same for the same reason. See the sources I gave above, and you can always know for yourself what's history and what is just legend and speculation.
I hope that whenever someone tells you something about what happened at Nicea that you will look at the creed and canons of the Council of Nicea and set them straight. Together we can spread the truth and end the fables.