Tradition
St. Jerome
De Viris Illustribus (Illustrious Men)
Chapter 32
Modestus also in the reign of Marcus Antoninus and Lucius Aurelius Commodus wrote a book Against Marcion which is still extant. Some other compositions pass under his name but are regarded by scholars as spurious.
Source: De Viris Illustribus (Illustrious Men) (New Advent)