I will go through Polycarp's letter to the Philippians next. He was the bishop of Smyrna. He and Ignatius both learned under John. He taught Irenaeus who gives the best information about him.
He is known for being martyred for the faith at age 86. The account of his martyrdom is also in this literature. It has some supernatural things that may or may not be legend, but it's plausible as this wasn't too far after the age of the Apostles. He is another one of my favorite people in ancient church history.