Constantine I

n. (A.D. 288-337, born as Flavius Valerius Aurelius Constantinus) Constantine the Great, Roman emperor between 312-337 who adopted Christianity; (1868-1923) king of Greece who ruled between 1913 to 1917 and between 1920 to 1922; Constantine I of Scotland, Constantine mac Cinaeda (836-877), King of the Scots who was a warrior king

Flavius Valerius Aurelius Constantinus (27 February c. 280 –  22 May 337 AD), commonly known as Constantine I, (among Roman Catholics) and Constantine the Great, or Saint Constantine (among Eastern Orthodox Christians), was a Roman Emperor, proclaimed Augustus by his troops in 306, who ruled an ever-growing portion of the Roman Empire until his death. Best known for being the first Christian Roman Emperor, his Edict of Milan put an end to institutionalized persecution of Christians in the Empire.
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Noun
1. Emperor of Rome who adopted the Christian faith and stopped the persecution of Christians (280-337)
(synonym) Constantine, Constantine the Great
(hypernym) Roman Emperor, Emperor of Rome