When I, Constantine Augustus, and I, Licinius Augustus, fortunately met at Milan... we resolved to grant both to Christians and to all men the freedom to follow whatever religion each one wished.
Cum feliciter tam ego Constantinus Augustus quam etiam ego Licinius Augustus apud Mediolanum convenissemus... ut daremus et Christianis et omnibus liberam potestatem sequendi religionem quam quisque voluisset.

Politicians
Constantine the Great
Roman emperor (r. 306-337) and the first Christian on the throne. Legalised Christianity (Edict of Milan, 313), convened Nicaea I (325) and founded Constantinople — yet executed his wife and son in 326.
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Source: ラクタンティウス『迫害者たちの死について』48 (ミラノ勅令、313年)Verified