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Prochorus (Greek: Πρόχορος, Prochoros) was one of the Seven Deacons chosen to care for the poor of the Christian community in Jerusalem (Acts 6:5). According to holy tradition, he was also one of the Seventy Disciples sent out by Jesus in Luke 10.
Tradition calls Prochorus the nephew of Saint Stephen the Protomartyr. Prochorus accompanied Saint Peter, who ordained him to be the bishop in the city of Nicomedia. A variant tradition saw him as a companion of Saint John the Apostle, consecrated by the latter as bishop of Nicomedia in Bithynia. Some modern scholars dispute his having been the author of the apocryphal Acts of John, which is dated by them to the end of the 2nd century. According a the late tradition, he was the bishop of Antioch and ended his life as a martyr in Antioch in the 1st century.
In Orthodox iconography, Prochorus is depicted as a scribe of John the Theologian. He is one of four out of the Seven Deacons of the Seventy Apostles to be jointly celebrated on 28 July.
General info from Wikipedia.org