Miltiades was pope when Constantine issued the Edict of Milan ... Remember that a decade earlier, the Empire was in the throes of the Diocletian Persecution, the last but rather severe persecution ...
who ruled in the West while Diocletian himself remained close to the Persian frontier. He also appointed two caesares— Galerius and Constantius I Chlorus—to further administer the sprawling polity.
He was imprisoned during the Diocletian persecution and only released when Constantine the Great came to power and made Christianity the official religion of the Roman Empire. He is also called ...
The persecutions that began under Diocletian, however ... The persecution came to an end in 313, when the co-emperors Constantine and Licinius signed the Edict of Milan, which granted tolerance ...