Edict of Toleration by Galerius
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This was an edict, issued in 311 by the Roman Tetrarchy of Galerius, Constantine and Licinius, officially ending the Diocletian persecution of Christianity.
Galerius who had been one of the leading figures in the persecutions, admitted that the policy of trying to eradicate Christianity had failed, saying: "wherefore, for this our indulgence, they ought to pray to their God for our safety, for that of the republic, and for their own, that the republic may continue uninjured on every side, and that they may be able to live securely in their homes."
Christianity was officially legalized in the Roman Empire two years later in 313 by Constantine in his Edict of Milan.