theophilus
Epistle to Autolycus: Book I
A first letter to a sceptical friend on why the Christian God cannot be seen, and how he may be known.
Epistle to Autolycus: Book II
A second letter contrasting the Greek poets with Genesis, and the earliest use of the word Trinity.
Epistle to Autolycus: Book III
A third letter arguing from chronology that the Hebrew Scriptures are older than Greek learning.