There is very little evidence for the life of Pelagonius.  Among our only sources is the explicit of Codex Riccardianus 1179, which reads “Commentum artis medicinae seu veteranaeriae [sic] explicit Pelagoniorum Saloniniorum.”  From this it appears that Pelagonius came from the Dalmatian city of Salona, and it seems possible - on other grounds - to date his activity to the period of 350-400 AD: he is cited in the preface to the Digesta artis mulomedicinae by Vegetius, who wrote that work between 383 and 450 AD, but is not mentioned by the author of the Mulomedicina Chironis, which was probably written in 400 AD.  The Commentum is dedicated to a certain friend Arzygius, whom many scholars have identified as the Betitius Perpetuus Arzygius for whom a statue was erected in 366 AD (Bücheler, Jones, Merlindale, Morris, Flammini; contra Fischer).  We know little else about his life.  He does not appear to have been a mulomedicus by trade, but rather a dedicatee driven by great passion for veterinary science: he particularly loved horses, the species to which he dedicated his work.  [V. Rinaldi; tr. C. L. Caterine].