Philastrius was a 4th-century bishop of Brescia who lived during the Roman era. Born around 330, he renounced his family inheritance to pursue a religious life, a choice compared by hagiographers to the journey of Abraham. He traveled widely across the Roman Empire, preaching against various heretical groups, most notably the Arians. During his time in Milan, he supported the Catholic faction and reportedly met Augustine of Hippo around 383. His career concluded with his appointment as the bishop of Brescia, where he eventually died.