From persecutor to confessor
The pivot of Procopius's life, as his vita tells it, is the encounter on the road. Carrying an imperial commission to root out the Church, Neanius is instead arrested by a vision near Apamea in Syria — an episode the tradition deliberately frames after the conversion of the Apostle Paul, with a radiant cross in the sky and a voice naming the crucified Jesus as the Son of God.
The vita carries the reversal further: rather than persecute Christians, the converted officer is said to have turned his arms against barbarian invaders, and when summoned to account for himself he tore up Diocletian's decree before the authorities. This act of open defiance, treated as an insult to imperial authority, sent him in chains to Caesarea.