Called “Abuna” or “the fa­ther” of Ethiopia, sent to that land by St. Athanasius. Frumentius was born in Tyre, Lebanon. While on a voyage in the Red Sea with St. Aedesius, possibly his brother, only Frumentius and Aedesius survived the shipwreck. Taken to the Ethiopian royal court at Aksum, they soon attained high positions. Aedesius was royal cup bearer, and Fruementius was a secretary. They introduced Christianity to that land. When Abreha and Asbeha inherited the Ethiopian throne from their father, Frumentius went to Alexandria, Egypt, to ask St. Athanasius to send a missionary to Ethiopia. He was consecrated a bishop and converted many more upon his return to Aksum. Frumentius and Aedesius are considered the apostles of Ethiopia.

http://www.catholic.org/saints/saint.php?saint_id=648