Ignatius of Antioch (/ɪɡˈneɪʃəs/; Greek: Ἰγνάτιος Ἀντιοχείας, Ignátios Antiokheías; c. 35 AD  – c. 108/140 AD), also known as Ignatius Theophorus (Ιγνάτιος ὁ Θεοφόρος, Ignátios ho Theophóros, lit. "the God-bearing") or Ignatius Nurono (lit. "The fire-bearer"), was an early Christian writer and bishop of Antioch. While en route to Rome, where he met his martyrdom, Ignatius wrote a series of letters. This correspondence now forms a central part of the later collection known as the Apostolic Fathers, of which he is considered one of the three chief ones together with Pope Clement I and Polycarp. His letters also serve as an example of early Christian theology. Important topics they address include ecclesiology, the sacraments, and the role of bishops.

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