Ignatius is considered a disciple of the Apostle John, John himself is said to have appointed Ignatius Bishop of Antioch – today’s Antakya/Hatay in Turkey. The oldest news about Ignatius comes from Polycarp of Smyrna and then essentially from Eusebius of Caesarea.
Ignatius is said to have suffered martyrdom under Emperor Trajan. He was brought to Rome in a journey lasting several months, during which time he is said to have written the Seven Holy Letters, which are attested by Eusebius and handed down under his name.
Ignatius is regarded by the Orthodox Church as the Father of the Church, he is also counted among the Apostolic Fathers in the West. All the patriarchs of Antioch bear the name Ignatius in his honor. The Coptic Church calls him Pope and Successor of Peter.
Joachim Schäfer: Article Ignatius of Antioch, from the Ecumenical Dictionary of Saints: https://www.heiligenlexikon.de/BiographienI/Ignatius_von_Antiochien.htm