What was the first major empire in the world to officially adopt Christianity as a state religion?

Rome
Byzantine Empire
Kingdom of Aksum (Africa)
Persia
In about 316 AD, Frumentius and his brother Edesius from Tyre were taken to the Ethiopian court as slaves. They were given positions of trust by the monarch, and converted members of the royal court to Christianity. Ethiopia, a major empire at the time, was the second country to officially adopt Christianity (after Armenia).
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reach: rather globalAfricaChristianityEast AfricaEthiopiahistory of Christianityhistory of religionsreligions

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Rome
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Persia
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