Q:

When did Christianity become the official religion of Rome?

A:

Quick Answer

Christianity became the official religion of Rome during the reign of Emperor Theodosis I, who ruled from 379 to 395 A.D., according to National Geographic. Theodosis I was the first emperor to decree that all Roman citizens follow Christianity.

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Full Answer

Christianity first began to flourish under Roman rule during the time of Emperor Constantine, who converted to the religion in 312 A.D. Although he brought a strong Christian presence to the empire, Roman culture and institutions resisted the change for more than half a century. By the time Emperor Theodosis I ascended to power, the Roman Empire was beginning to crumble. Theodosis I was the last emperor to preside over a united Roman Empire.

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