Which Roman emperor promoted Christianity after the toleration agreement of 313?

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In 313, Constantine and Licinius issued provisions traditionally known as the Edict of Milan, granting Christians and other religious groups the freedom to worship. Constantine then supported the Church, convened the Council of Nicaea in 325 and founded Constantinople, inaugurated in 330. He received baptism shortly before his death in 337. However, he did not make Christianity the official religion of the Empire. This stage is associated with Emperor Theodosius I and the Edict of Thessalonica of 380, which established Nicene Christianity as the imperial religious standard. His reign profoundly transformed the relationship between imperial power and the Church.