Saint Donatus of Arezzo (Italian: San Donato di Arezzo) is the patron saint of Arezzo, and considered a bishop of the city. A Passio of Donatus' life was written by a bishop of Arezzo, Severinus; it is of questionable historicity. He calls Donatus a martyr, though Donatus is described as a bishop and confessor of the faith in ancient sources rather than as a martyr. An early hagiography of Donatus was already known to Gregory the Great. According to tradition, Donatus was martyred on August 7, 362 during the reign of Julian the Apostate and was a native of Nicomedia.