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*306-37 Reign of Emperor [[Constantine the Great]].
*ca. 306 Death of Great-Martyr [[Barbara of Nicomedia]]; death of Bp. [[Parthenios of Lampsacus]].
*311 Martyrdom of Bp. [[w:Methodius of Olympus|Methodius of Olympus]].
*313 [[Edict of Milan]] issued by [[Constantine the Great]] and co-emperor Licinius, officially declaring religious freedom in the Roman Empire.
*314 [[Council of Ancyra]] held, the first post-persecution council.
