Polycarp

Now when Polycarp entered into the arena there came a voice from heaven: “Be strong, Polycarp, and play the man.” And no one saw the speaker, but our friends who were there heard the voice. And next he was brought forward, and there was a great uproar of those who heard that Polycarp had been arrested.

Therefore when he was brought forward the Pro-Consul asked him if he were Polycarp, and when he admitted it he tried to persuade him to deny, saying: “Respect your age,” and so forth, as they are accustomed to say: “Swear by the genius of Caesar, repent, say: ‘Away with the Atheists'”;* but Polycarp, with a stern countenance looked on all the crowd of lawless heathen in the arena, and waving his hand at them, he groaned and looked up to heaven and said: “Away with the Atheists.”

But when the Pro-Consul pressed him and said: “Take the oath and I let you go, revile Christ,” Polycarp said: “For eighty and six years have I been his servant, and he has done me no wrong, and how can I blaspheme my King who saved me?”

But when he persisted again, and said: “Swear by the genius of Caesar,” he answered him: “If you vainly suppose that I will swear by the genius of Caesar, as you say, and pretend that you are ignorant who I am, listen plainly: I am a Christian. And if you wish to learn the doctrine of Christianity fix a day and listen.”

*The Christians were considered atheists, since they did not believe in the multiplicity of gods.

The Martyrdom of Polycarp, Apostolic Fathers (Loeb Classical Library, trans. Kirsopp Lake, 1912)

http://www.earlychristianwritings.com/text/martyrdompolycarp-lake.html