Con·stan·tine I 1 
(kŏnstən-tēn′, -tīn′) Known as "Constantine the Great." Originally Flavius Valerius Constantinus. AD 285?-337.
(kŏnstən-tēn′, -tīn′) Known as "Constantine the Great." Originally Flavius Valerius Constantinus. AD 285?-337. Emperor of Rome (306-337) who adopted the Christian faith and suspended the persecution of Christians. He rebuilt Constantinople (now Istanbul) as the new Rome (330).