Page "Liber Pontificalis" Paragraph 3

During the Middle Ages, Saint Jerome was considered the author of all the biographies up until those of Pope Damasus I ( 366 – 383 ), based on an apocryphal letter between Saint Jerome and Pope Damasus published as a preface to the Medieval manuscripts.

The attribution originated with Rabanus Maurus and is repeated by Martin of Opava, who extended the work into the 13th century.

Other sources attribute the early work to Hegesippus and Irenaeus, having been continued by Eusebius of Caesarea.