Ezana's Conversion: Aksum Adopts Christianity in the 4th Century

Ezana’s conversion to Christianity in the 4th century AD made the Kingdom of Aksum, in what is now Ethiopia and Eritrea, one of the first states in the world whose ruler officially adopted the faith. Guided by Frumentius, a Christian from Tyre who had grown up at the Aksumite court, King Ezana replaced the old gods on his inscriptions and coins with Christian symbols, probably in the 330s or 340s. The change laid the foundations of the Ethiopian Orthodox Tewahedo Church, one of the oldest Christian churches in the world.

Background: Aksum and its religion

The Kingdom of Aksum was a major trading power, linking the Roman Empire, Arabia and India through the Red Sea. Its rulers erected giant stone monuments over royal tombs, including the famous obelisks of Aksum, and issued coins with inscriptions in Greek.

Before Christianity, the Aksumite kings worshipped a group of gods that included Mahrem, a god of war and kingship whom Greek texts equated with Ares, together with Astar, Beher and Meder. Royal coins carried a crescent and disc, symbols linked to these older beliefs. Through trade, however, Aksum was in regular contact with Christians from the Roman world.

Frumentius and Aedesius

The main account of how Christianity reached Aksum comes from Rufinus of Aquileia, who wrote an Ecclesiastical History around AD 402. He said he heard the story from Aedesius himself.

According to Rufinus, a philosopher from Tyre named Meropius sailed on the Red Sea with two young relatives, Frumentius and Aedesius. When their ship stopped at a port, local people killed the crew but spared the two boys, who were brought to the king. Aedesius became the king’s cupbearer and Frumentius his secretary and treasurer.

After the king died, the queen asked the young men to help govern while her son was a child. Frumentius used his influence to support Christian merchants from the Roman Empire, helping them build places of prayer. When the prince came of age, Aedesius returned to Tyre, while Frumentius travelled to Alexandria in Egypt and asked Bishop Athanasius to send a bishop to Aksum. Athanasius consecrated Frumentius himself and sent him back.

Rufinus does not name the king, but the young prince is generally identified with Ezana. Athanasius became bishop of Alexandria in 328, so Frumentius’ consecration took place after that date, probably in the 330s or 340s.

Evidence from Rome

An independent source confirms the outline of the story. Around AD 356 the Roman emperor Constantius II, who supported the Arian form of Christianity, wrote to the rulers of Aksum, whom he named Aizanas and Sazanas. These are generally identified as Ezana and his brother, called Saiazana in Ezana’s own inscriptions. He asked them to send Frumentius to Alexandria to be examined by the Arian bishop George, who had replaced Athanasius.

Athanasius preserved the text of this letter in his Defence before Constantius, written to clear himself before the emperor. The letter is the earliest outside evidence that Aksum’s rulers had accepted Christianity, and it names Ezana in a form close to his own inscriptions. It shows that Frumentius was bishop in Aksum at that time and that Ezana was still on the throne. There is no evidence that the Aksumite rulers complied.

Inscriptions and coins

Ezana left several inscriptions in Ge’ez, Greek and a South Arabian script, recording his campaigns. In the earlier ones he calls himself “son of Mahrem” and thanks the traditional gods for victory. In later inscriptions he invokes a single “Lord of Heaven”, notably in his Ge’ez account of a war against the Noba people on the Nile, and a Greek inscription found at Aksum in 1969 explicitly names the Father, the Son and the Holy Spirit. This campaign is linked to the end of the old kingdom of Kush, as described in the fall of Meroë.

Aksum’s coins tell the same story. Early coins of Ezana show the crescent and disc, while later issues replace them with a cross. These are among the earliest coins anywhere to carry the Christian cross, appearing in the mid-4th century, and they would have spread the new symbol through trade across the region.

Why did Ezana convert?

No source records Ezana’s own reasons, so historians can only suggest explanations. Personal conviction, shaped by Frumentius, who had been close to him since childhood, was probably important, and Rufinus presents the conversion as a matter of faith.

Political and economic factors may also have played a part. Aksum’s wealth depended on trade with the eastern Roman Empire, where emperors from Constantine onwards supported Christianity. Sharing the faith of Rome’s rulers and merchants could strengthen diplomatic and commercial ties. Some historians also point to rivalry with the Persian Empire and with South Arabian kingdoms across the Red Sea, where Judaism and Christianity were both spreading.

The conversion appears to have been gradual. The transition from inscriptions naming Mahrem, to those naming a single “Lord of Heaven”, and only then to explicitly Christian texts suggests that Ezana introduced the new faith cautiously, perhaps to avoid alienating nobles and priests attached to the old gods.

Spread of the faith

At first Christianity was the religion of the king, the court and the merchant community. Churches were built at Aksum, and according to tradition the first cathedral of Mary of Zion stood on the site of the present church in the city.

The faith took deeper root over the next two centuries. In the late 5th century, monks known in Ethiopian tradition as the Nine Saints arrived, probably from the eastern Roman provinces, and founded monasteries such as Debre Damo. They helped translate scripture into Ge’ez and carry Christianity into the countryside.

Legacy

Because Frumentius was consecrated in Alexandria, the Ethiopian church remained tied to the Coptic Patriarchate of Alexandria for more than 1,500 years, receiving its senior bishop from Egypt until it gained its own patriarch in 1959. Ethiopian tradition honours Frumentius as Abba Salama, often called Kesate Birhan, “Revealer of Light”, and remembers the royal brothers as Abreha and Atsbeha.

Aksum’s conversion took place in the same century as the Roman Empire’s turn towards Christianity after the Edict of Milan. Over time the Ethiopian church developed its own liturgy, calendar and traditions, and Ge’ez, the language of Ezana’s inscriptions, remains its liturgical language today. It created a Christian kingdom in Africa that would survive, in changing forms, through the Middle Ages and into modern times.

Timeline

• c. 320s: Frumentius and Aedesius are taken to the Aksumite court as youths.
• 328: Athanasius becomes bishop of Alexandria.
• c. 330s–340s: Frumentius is consecrated bishop; Ezana adopts Christianity.
• c. 340s–350s: Aksumite coins begin to bear the Christian cross.
• c. 350: Ezana campaigns against the Noba and thanks the “Lord of Heaven” in an inscription.
• c. 356: Constantius II writes to Aizanas and Sazanas about Frumentius.
• c. 402: Rufinus records the story of Frumentius and Aedesius.
• Late 5th century: The Nine Saints arrive and spread monasticism.

Why it matters

Ezana’s conversion made Aksum one of the earliest Christian states and began a Christian tradition that remains central to Ethiopian identity today. It also shows that early Christianity spread not only across the Roman Empire but along the trade routes of Africa and the Red Sea.