July 25, 306 AD Constantine became emperor in AD 306, following the death of his father, Constantius Chlorus. Constantine the Great (reigned AD 306–337) is most known for transforming Christianity from a persecuted faith into a legally recognized and increasingly favoured religion within the Roman Empire.
Constantine, along with Licinius, issued the Edict of Milan, which granted religious tolerance throughout the Roman Empire. It legalized Christianity, ending centuries of persecution allowed Christians to worship freely and restored confiscated Church property.
Constantine convened the First Council of Nicaea, the first ecumenical council of the Christian Church, to resolve the Arian controversy (debate over whether Christ was fully divine or created), affirm the divinity of Christ and promote doctrinal unity that led to the creation of the Nicene Creed, a foundational statement of Christian faith.




