Answer: Constantine I
Some extra relevant information:
The Proclamation of Milan, also known as the Edict of Milan, was issued by the Roman Emperor Constantine the Great in the year 313 AD. The Edict of Milan marked a significant turning point in the history of Christianity and religious freedom within the Roman Empire. Constantine, the first Roman emperor to embrace Christianity, played a pivotal role in changing the status of Christianity from a persecuted religion to a tolerated and eventually favored one.
The proclamation was jointly issued by Constantine and Licinius, another Roman emperor ruling over the eastern part of the empire at that time. The Edict of Milan granted religious freedom and tolerance to all individuals, including Christians, allowing them to worship freely without fear of persecution. The decree not only ended the persecution of Christians but also restored their confiscated properties and granted them the right to rebuild their places of worship.
The Proclamation of Milan marked a critical shift in Roman policy towards Christianity. It laid the foundation for the eventual establishment of Christianity as the state religion of the Roman Empire under Theodosius I in 380 AD. The edict also had wider implications for religious freedom and tolerance throughout history, serving as a model for many subsequent legal and constitutional reforms related to religious liberty.
Overall, the Proclamation of Milan, issued by Emperor Constantine the Great in 313 AD, was a pivotal moment in the history of Christianity and the Roman Empire. It granted religious freedom and tolerance to Christians, allowing the religion to prosper and eventually become the dominant faith within the empire.