Although Christianity became the official religion of the Aksumite kingdom in the fourth century, the religion had been known in Ethiopia since a much earlier time. In the Acts of the Apostles, VIII: 26-40, we are told of a certain Eunuch, the treasures of Queen Candace of Ethiopia, who went to Jerusalem to worship the God of Israel. There he met Philip the Deacon and was baptized by him. Ethiopian tradition asserts that he returned home and evangelized the people. In his Homily on Pentecost, St. John Chrysostom mentions that the Ethiopians were present in the Holy City on the day of Pentecost. Later, when the Apostles went out to preach the Gospel, Matthew was allotted the task of carrying the good news to Ethiopia, where he suffered martyrdom. Ethiopian sources, such as the Synaxarium, make no mention of this, however; on the contrary, Ethiopians believe that received Christianity without shedding apostolic blood. Nevertheless, Christianity without certainly known in Ethiopia before the time of Frumentius, being the faith practiced by many of the merchants from the Roman Empire Settled in the Aksumite region. In important cities, such as Axum and Adulis, these Christian merchants had their prayer houses and openly practiced their religion.
The introduction of Christianity as the state religion of Ethiopia came about not as the result of organized evangelical activity from outside the country, but because it was the desire of the king. The story of the conversation of the Axumites has come down to us in the work of the contemporary Church historian, Rufinus (d 410 A.D). Meropius, a philosopher from Tyre, set out to visit India accompanied by two young relatives, Frumentius and Aedesius, Apparently they followed the usual itinerary of the time along the Africa coast of the Red Sea. In the course of their journey they run short of provisions and put in at a port of the African coast. The local inhabitants, however, were hostile to Roman citizens, as they massacred Meropius and all aboard the ship, sparing only the two boys, who were taken to the king. They soon gained his interest and won his confidence. The younger, Aedesius, he made his cup-bearer, while the elder, Frumentius, who showed signs of wisdom and maturity, become his treasurer and secretary. The king died early, leaving his wife with an infant son as heir to the throne. Now the dying king had given Frumentius and Aedesius leave to return to their own country if they so wished, but the Queen-Mother who was left as Regent, begged them to remain to help her administer the kingdom until her son should grow up. The young men agreed, and stayed to carry out the task faithfully.
The thought of Frumentius then began to turn towards matters of faith. He sought out Christians among the Roman merchants settled at Axum, and encouraged them to establish meeting-places for prayer, helping then in every way he could, according them favours and benefits, and gradually spreading the seed of Christianity among the people. The young king himself became a convert. When he was old enough to rule the country alone, Frumentius and Aedesius asked him for permission to leave Axum. Aedesius returned home to Tyre, but Frumentius went to Alexandria and laid the whole affair before the newly- appointed patriarch, Athanasius, begging him to appoint a bishop to minister to the needs of the growing Christian community at Axum. The patriarch summoned a council of priests to consider the matter. It was agreed that Frumentius himself should be consecrated as the first Bishop of Axum. Thus he returned to propagate the faith in the land he knew so well so well. Although Rufinus does not specify the name of the country to which Frumentius went, other sources are more specific in this respect. A letter from the Emperor Constantius, written in 356 A.D to his “precious brothers”, Aezana and Saezana, rulers of Axum, concerns the Bishop Frumentius. Furthermore, the inscriptions and coins of the Emperor Ezana testify to his adoption of Christianity. In his earlier inscriptions he styles himself “Son of unconquered Mahrem”, but in the inscription after his victory over Nubia the employed anew terminology, speaking of “the Lord of heaven and earth”, and describing how he had destroyed the “images in their temples”, thus affirming his dissociation from paganism. A recently discovered Greek inscription belonging to Ezana leaves no doubt on this matter. It begins: “in the faith of God and the power of the Father, the Son and the Holy Ghost”. Likewise, the coins minted in the early part of Ezana’s reign bear the pagan symbol of the crescent and disc, while those minted in the later part of his reign bear the sign of the cross……………………….