Justin Martyr:
Justin Martyr (100-165) was a philosopher who considered the ideas of numerous secular teachers before converting to Christianity. He was a devoted evangelist and apologist for the Christian faith and was executed in Rome as a martyr.
People
Polycarp:
Polycarp (69-156) was a personal disciple of the Apostle John and was appointed by John to be the bishop of the church at Smyrna. He was a friend of Ignatius and teacher of Irenaeus. He lived an exemplary life and died as a martyr.
Ignatius:
Ignatius (35-107) was a disciple of John and bishop of the church at Antioch. He died as a martyr in Rome.
Clement of Rome:
Clement of Rome (35-99) was bishop of the church at Rome. He likely learned from Peter and Paul, and tradition holds that he is mentioned in Philippians 4:3.
Barnabas:
Barnabas, an apostle according to Acts 14:14, traveled with the Apostle Paul and John Mark on several missionary journeys. He was martyred in AD 61.