Little is known about St. Zephyrinus, who was pope of Rome from c. 198 or 199 until 217. The antipope who opposed him, St. Hippolytus, says he was a simple and avaricious man. He adds that Zephyrinus relied too much on his deacon, Callixtus, who was in charge of the church's cemetary. Zephyrinus battled the heresies of adoptionism, modalism, and monarchianism, although Hippolytus accuses him of being a modalist himself. Eusebius, on the other hand, writes of him favourably, and he has always been venerated as a saint.
Karen Rae Keck and Norman Hugh Redington