Constantine Augustus and Licinius Augustus
The persecution of Christians ended in 313 when Constantine of the West and Licinius of the East proclaimed the Edict of Milan, which established a policy of religious freedom for all. This is an English translation of the edict.

From Lactantius, De Mort. Pers., ch. 48. opera, ed. 0. F. Fritzsche, II, p 288 sq. (Bibl Patr. Ecc. Lat. XI).

Translated in University of Pennsylvania. Dept. of History: Translations and Reprints from the Original Sources of European history, (Philadelphia, University of Pennsylvania Press [1897?-1907?]), Vol 4:, 1, pp. 28-30. This text is in the public domain.

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When I, Constantine Augustus, as well as I, Licinius Augustus, fortunately met near Mediolanurn (Milan), and were considering everything that pertained to the public welfare and security, we thought, among other things which we saw would be for the good of many, those regulations pertaining to the reverence of the Divinity ought certainly to be made first, so that we might grant to the Christians and others full authority to observe that religion which each preferred; whence any Divinity whatsoever in the seat of the heavens may be propitious and kindly disposed to us and all who are placed under our rule. And thus by this wholesome counsel and most upright provision we thought to arrange that no one whatsoever should be denied the opportunity to give his heart to the observance of the Christian religion, of that religion which he should think best for himself, so that the Supreme Deity, to whose worship we freely yield our hearts) may show in all things His usual favor and benevolence. Therefore, your Worship should know that it has pleased us to remove all conditions whatsoever, which were in the rescripts formerly given to you officially, concerning the Christians and now any one of these who wishes to observe Christian religion may do so freely and openly, without molestation. We thought it fit to commend these things most fully to your care that you may know that we have given to those Christians free and unrestricted opportunity of religious worship. When you see that this has been granted to them by us, your Worship will know that we have also conceded to other religions the right of open and free observance of their worship for the sake of the peace of our times, that each one may have the free opportunity to worship as he pleases; this regulation is made we that we may not seem to detract from any dignity or any religion.