Schaff, Philip. History of the Christian Church (The Complete Eight Volumes in One). Amazon Kindle Edition, 2014.
Volume 2, Ante-Nicene Christianity A.D. 100-325, “Chapter 13. Ecclesiastical Literature of the Ante-Nicene Age, and Biographical Sketches of the Church Fathers.” sec. 159-204.
§ 192. Minor Divines of the Greek Church.
Schaff considers several third century divines to be worthy of mention. Heraclas and Plutarch, brothers, studied with Origen. Heraclas served as bishop of Alexandria from 233-248 (Schaff 2014, loc. 22782). Schaff also notes Theognostus, who is mentioned by both Athanasius and Photius (Schaff 2014, loc. 22787). Pierius was probably a teacher in the catechetical school of Alexandria around the year 300. Pamphilius, a teacher at Caesarea, was a strong promoter of theological education (Schaff 2014, loc. 22792). Peter was a bishop of Alexandria from 300 until he was beheaded in 311 (Schaff 2014, loc. 22797). Hierax, considered sometimes as a Manichaean heretic, was well respected for his exegetical work (Schaff 2014, loc. 22806).