In 313 AD the Roman emperor Constantine I published the Edict of Milan, which established that

A)
paganism was outlawed in the empire.

B)
it was illegal for soldiers to be Christians.

C)
Christians were freed from religious penalties.

D)
all Roman citizens were required to convert to Christianity.

C. Christians were freed from religious penalties.

Explanation: Edict of Milan, proclamation that permanently established religious toleration for Christianity within the Roman Empire. It was the outcome of a political agreement concluded in Mediolanum (modern Milan) between the Roman emperors Constantine I and Licinius in February 313.

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