The First Gentile Convert
The account of Cornelius in Acts chapter ten marks a turning point in the early Church: the reception of a Gentile into the community of believers without first becoming a Jew. The angel's instruction to Cornelius and Peter's parallel vision of the sheet of animals are presented as a coordinated divine action opening the Gospel to the nations.
His baptism proved controversial among the first believers and contributed to the wider debate over whether Gentile converts were bound by Jewish observances such as circumcision. That question was eventually addressed at the Council of Jerusalem described in Acts chapter fifteen.
Traditional Accounts
Orthodox tradition extends Cornelius's life beyond the New Testament. After his baptism he is said to have left worldly affairs and preached the Gospel alongside the Apostle Peter, who ordained him a bishop. When Peter learned of intense idolatry in the city of Skepsis, lots were drawn and Cornelius was sent there with Saint Timothy.
In Skepsis a learned prince named Demetrius, devoted to Apollo and Zeus, opposed him. The tradition relates that when Cornelius entered the pagan temple and prayed facing east, an earthquake destroyed the temple and its idols. Imprisoned, Cornelius learned that Demetrius's wife and child had been buried in the rubble, yet they were found alive, said to be praising the God of the Christians. Witnessing this, Demetrius and his household received baptism, the saint converted the city, and he appointed a presbyter named Eunomios to serve there.
Historians regard the tradition that Cornelius became a bishop, whether of Caesarea or of Skepsis in Mysia, as uncertain, in contrast to the scripturally attested account of his baptism.
Veneration
The Orthodox Church commemorates Cornelius as a hieromartyr on September 13. He is also honored in the Western tradition: his feast falls on October 20 in the Roman Catholic Church and February 4 in the Episcopal Church, while the Armenian Apostolic Church commemorates him on the Tuesday following the third Sunday of Advent.