Answer:
Constantine was a Roman emperor who ruled early in the 4th century. He was the first Christian emperor and saw the empire begin to become a Christian state. He was born Feb 27, after 280 CE and passed away May 22, 337 AD.
Explanation:
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It was the Notre Dame Cathedral that Napoleon saved from demolition in 1802.
In 1804 he was then crowned in the cathedral as the Emperor of France