Constantius II
He was holding the office of "notarius" when, in 354, Emperor Constantius II ordered him, Eusebius and Mallobaudes to interrogate Constantius Gallus, formerly Caesar of the East and cousin of Constantius II, while he was held prisoner in Pula, asking him reason for each man he had put to death. Gallus was sentenced to death and Serenianus, Apodemius and Pentadius executed him.