[1] Remembered for his sense of charity, he is the patron saint of Reggio Emilia, although its cathedral is not dedicated to him.

Instead, the church of San Prospero, which Prosper himself had built and dedicated to Saint Apollinaris, commemorates his episcopate.

Tradition holds that the Bishop Prosper was able to deflect the onslaught of Attila the Hun by miraculously calling for a fog to hide the city.

The Reggio diocese celebrates his cult locally on 24 November but 25 June is his feast day on general calendars.

In the tenth century, Reggio being vulnerable to attacks from the sea, Bishop Ermenald (Ermenaldo) transported his relics to the Cathedral of Santa Maria in the center of the city while the church dedicated to Prosper was being built.