Gennadius. Lives of Illustrious Men 35
35 Eusebius the bishop
Eusebius wrote On the mystery of our Lord’s cross and the faithfulness of the apostles, and especially of Peter, gained by virtue of the cross.
Philip Schaff and Henry Wace (eds.), New York: Christian Literature Publishing Co., 1890-1900. Public domain: English translation first published 1885-1900 (Nicene and Post-Nicene Fathers, Second Series).