pupil of Lactantius
Demetrianus was a former pupil of Lactantius, but little is known about him. It was to him that Lactantius, a convert to Christianity, addressed his book On the Workmanship of God, probably written in Bithynia around 304 C.E. In Divine Institutes 2.10.15, Lactantius also mentioned having written for Demetrianus about God’s workmanship.