He is widely venerated in the Rhine valley region of Germany and the Low Countries, and he is a patron saint of Buda and of protection against lightning.

When Faustus was deathly ill, his wife Flaminia sought the intercession of Saint Gervasius, who assured her that her husband would recover and beget a son.

According to the contemporary writer Dio Cassius, part of the legion was surrounded and nearly overwhelmed when it was miraculously saved by a divine thunderstorm.

Pope Innocent X bequeathed Donatus's relics to the Jesuit church in Muenster Eifel, and they were carried in procession from Rome to the Rhineland.

Some writers comment on the alliteration between the Latin name Donatus and the German title Donner, which means "Thunderer".

Although he is not in the Roman Martyrology, he shares a feast day with his namesake, Saint Donatus of Arezzo, on 7 August.

In Hungary, where he has a widespread cult in the Balaton wine region, his protection for the vintage is asked on 7 August.