Poseidonius
2. The son of Philostorgius and brother of Philagrius, who lived in the latter half of the fourth century after Christ, during the reign of Valentinian and Valens. (Philostorg. H. E. 8.10.) [W.A.G]
From William Smith (ed.), Dictionary of Greek and Roman Biography and Mythology. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.