The proclamation by Galerius that gives tolerance to Christianity.
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History shows that most Roman emperors were tolerant of Christianity. It was Galerius who formalised this by proclaiming the Edict of Toleration, overturning the Great Persecution of Diocletian.Constantine subsequently extended privileges to the Christian Church by the Edict of Milan.AnswerThe Roman emperor Galerius issued the Edict of Toleration that brought an end to the Great Persecution instituted by his predecessor, Diocletian. Strangely, it was Galerius who had pressured Diocletian to undertake the persecution of Christians. Constantine subsequently issued a further edict, the Edict of Milan that gave the Christians positive advantages.
Frederick II in 1241
The Hagia Sophia was the main Christian church in Constantinople. It was converted into a mosque when the Muslims took over the city. I believe it is a museum now.
That the emporer made Christianity one of the few religions approved
The Edict of Milan helped spread Christianity by allowing all religions in Rome.