Julius Firmicus Maternus

Julius Firmicus Maternus was a Roman Latin writer and astrologer, who received a pagan classical education that made him conversant with Greek; he lived in the reign of Constantine I and his successors. His triple career made him a public advocate, an astrologer and finally a Christian apologist. The explicit, or end-tag, of the sole surviving manuscript of his De errore profanarum religionum gives his name as Iulius Firmicus Maternus V C, identifying him as a vir clarissimus and a member of the senatorial class. He was also author of the most extensive surviving text of Roman astrology, Matheseos libri octo written around 334–337. Manuscripts of this work identify him as "the younger" (iunior) or "the Sicilian" (Siculus). The lunar crater Firmicus was named in his honour.