What was the Edict of Milan known for?

The Edict of Milan, issued in 313 AD by the Roman emperors Constantine and Licinius, is primarily recognized for making Christianity legal in the Roman Empire. This landmark decree ended the persecution of Christians and granted them the freedom to practice their faith openly. The Edict not only legitimized Christianity but also allowed for the return of confiscated religious property and served as a significant turning point in the relationship between the Roman state and the Christian church. It marked the beginning of a new era where Christianity would not only be tolerated but would eventually become the state religion of the Roman Empire.

The other options relate to topics that are separate from the Edict of Milan's primary purpose and historical significance, focusing instead on military actions, governmental structures, and territorial governance, none of which pertain directly to the legal status of Christianity within the empire.