The only ancient information at our disposal on Pacian (290/320 - 379/393) is contained in Jerome's De viris inlustribus. Probably coming from a well-to-do family, Pacian had a classical education, and became Bishop of Barcelona; he was married and had a son, Dexter.
His preserved writings are all published in volume 410 of the Sources Chrétiennes: De Paenitentibus, De Baptismo, Epistola ad Simpronianum de Catholico Nomine, Epistola secunda, Contra Tractatus Novatianorum. The Cervulus treatise is not preserved.