... Donatus (given) occurs, like most of this class, in the African province, and belonged to the bishop of Numidia, whose rigour against the penitent lapsed made him the founder of the exclusive schismatical church named after him.  Another Donatus was St. Jermoe's tutor; and, before his time, several martyrs had been canonized by his name, and it seems to have prevailed in Gaul and Britain... (History of Christian Names, Yonge, 1884)