Eusebius of Caesarea

Letter to Flacillus

This work is a theological dedicatory letter addressed by Eusebius of Caesarea to Flacillus, the Bishop of Antioch. It serves as an introductory epistle accompanying Eusebius's treatise written against Marcellus of Ancyra. In the letter, Eusebius outlines the theological errors present in Marcellus's writings and explains how he refuted them. He then requests Flacillus to review and proofread his manuscript to ensure its doctrinal accuracy and completeness. Through this correspondence, the author seeks to defend orthodox faith and secure pastoral validation for his polemical work.