Barnabas (Ancient Greek: Βαρναβᾶς), born Joseph, was an Early Christian convert, one of the earliest Christian disciples in Jerusalem. Like almost all Christians at the time (see also Jewish Christians), Barnabas was one of the Children of Israel, specifically a Levite. Named an apostle in Acts 14:14, he and Saint Paul undertook missionary journeys together and defended Gentile converts against a faction promoting Gentile circumcision (see also Judaizers). They gained many converts in Antioch (c 43-44), traveled together making more converts (c 45-47), and participated in the Council of Jerusalem (c 50). Barnabas and Paul successfully evangelized among the "God-fearing" gentiles who attended synagogues in various Hellenized cities of Anatolia (modern day Turkey). Barnabas' story appears in the Acts of the Apostles, and Paul mentions him in some of his epistles. Tertullian named him as the author of the Epistle to the Hebrews, but this and other attributions are conjecture. Clement of Alexandria ascribed an early Christian epistle to Barnabas (Epistle of Barnabas), but that is highly improbable. Martyred at Salamis, Cyprus, in AD 61, he is traditionally identified as the founder of the Cypriot Church. The feast day of St Barnabas is celebrated on June 11. Some traditions hold that Aristobulus of Britannia, one of the Seventy Disciples, was the brother of Barnabas.