First known bishop of Agen in S France. His birth and death dates are uncertain. He became bishop after 347, and was alive in 392. He wrote Liber contra Arianos to refute the Arian heresy. At the* he at first refused to sign the Arian Confession, but was tricked into doing so by Valens. When he discovered the deception he protested strongly and cleared himself. He attended the Council of Valence in 372 and probably that of Saragossa in 380. He also penned De Fide Orthodoxa contra Arianos (which may have been written by ) and the Libellus Fidei which were thought to be part of the Orations of Gregory Nazianzus. He was known to Jerome and written to by Ambrose.