The Martyrdom of Polycarp - c. 155 AD

Eusebius: Church History - Book IV
"At this time, when the greatest persecutions were exciting Asia, Polycarp ended his life by martyrdom. But I consider it most important that his death, a written account of which is still extant, should be recorded in this history.
There is a letter, written in the name of the church over which he himself presided, to the parishes in Pontus, which relates the events that befell him, in the following words:"