Frumentius (ፍሬምናጦስ; died c. 383) was a Phoenician Christian missionary and the first bishop of Axum who brought Christianity to the Kingdom of Aksum. He is sometimes known by other names, such as Abuna ("Our Father") and Aba Salama ("Father of Peace").
He was ethnically a Phoenician, according to Rufinus, born in Tyre, modern day Lebanon. As a boy, he was captured with his brother, and they became slaves to the King of Axum. He freed them shortly before his death, and they were invited to educate his young heir. They also began to teach Christianity in the region. Later, Frumentius traveled to Alexandria, Egypt, where he appealed to have a bishop appointed and missionary priests sent south to Axum. Thereafter, he was appointed bishop and established the Church in Ethiopia, converting many local people, as well as the king. His appointment began a tradition that the Patriarch of Alexandria appoint the bishops of Ethiopia.
According to the fourth-century historian Tyrannius Rufinus (x.9), who cites Frumentius' brother Edesius as his authority, as children (ca. 316) Frumentius and Edesius accompanied their uncle Meropius from their birthplace of Tyre (now in Lebanon) on a voyage to Ethiopia. When their ship stopped at one of the harbors of the Red Sea, local people massacred the whole crew, sparing the two boys, who were taken as slaves to the King of Axum. The two boys soon gained the favor of the king, who raised them to positions of trust. Shortly before his death, the king freed them. The widowed queen, however, prevailed upon them to remain at the court and assist her in the education of the young heir, Ezana, and in the administration of the kingdom during the prince's minority. They remained and (especially Frumentius) used their influence to spread Christianity. First they encouraged the Christian merchants present in the country to practice their faith openly, and they helped them find places "where they could come together for prayer according to the Roman Rite"; later they converted some of the natives.