This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Christianity reaches the kingdom of Aksum, in the highlands of what is now Ethiopia, through Frumentius, a Mediterranean Christian brought to the Aksumite royal court as a young captive. Raised inside the court itself, Frumentius became tutor and then trusted advisor to the young King Ezana, and was later consecrated the first bishop of Aksum by Athanasius of Alexandria, tying the new Aksumite church directly to the wider Christian world.
The clearest evidence for what followed comes not from any narrative account but from Ezana's own coinage, struck under his authority and changed during his reign: its imagery shifts from the disc and crescent of the older Aksumite pantheon to the Christian cross, an independent and dateable record of the kingdom's religious change carried in the king's own currency.
Under Ezana, Christianity became Aksum's state religion, and Aksum became one of the earliest officially Christian states anywhere in the world, converting at state level within the same fourth century as Armenia. What this changed for Christianity's spread was the arrival of the faith at the level of a ruling court and a state religion in the Horn of Africa, decades before Rome's own empire made the same shift, planting a state Christianity in northeast Africa that would endure for centuries afterward.