Gennadius. Lives of Illustrious Men 38
38 Vigilius the bishop
Vigilius the bishop wrote to one Simplicianus a small book In praise of martyrs and an epistle containing the acts of the martyrs in his time among the barbarians.
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).