Answer :
when Constantine established a state-level religious tolerance in the roman empire, he took on the title of Justinian .
Constantine I, also known as Constantine the Great, was the first Roman emperor to convert to Christianity, reigning from AD 306 to 337. He was born in Naissus, Dacia Mediterranea, the son of Flavius Constantius, a Roman army officer of Illyrian origin who had been one of the Tetrarchy's four rulers.
Constantine the Great died on May 22, 337, in what is now Turkey, in the city of Nicomedia. He had reigned for 31 years. Constantine was buried in Constantinople's Church of the Holy Apostles and is remembered as the first Christian Roman emperor.
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