There is a beautiful legend in the church which we have no way of proving or disproving and that is that the child who Jesus held when the apostles were complaining about them annoying Jesus later grew up to be Ignatius.
Ignatius was martyred at Rome sometime around AD 100. On his way from Antioch to Rome, Ignatius wrote seven letters to various churches he was passing. These have left a wonderful historical record of the forming of the new church just after the time of the apostles.
However, it is as the first great defender of the faith against heresy that Ignatius is chiefly remembered. Docetism, the heresy that Jesus was not really a man and only seemed to be a man, was the first great heresy to attack the church.
Ignatius successfully defended the real humanity of Jesus against the Docetists. The church did not finally reach a consensus about who Jesus was until AD 452 and the Council of Chalcedon.