Pope Anicetus

Anicetus became bishop of Rome around 157, though some records place it as early as 153. His tenure was consumed by doctrinal firefighting: he actively opposed Gnosticism and Marcionism, rival interpretations threatening to fracture the young faith. In what became a famous episode of early church diplomacy, he welcomed Polycarp of Smyrna to Rome to hash out the Easter controversy — a calendar dispute that wouldn't be settled for generations. He died in April 168, having held the line during one of Christianity's most vulnerable centuries.