Suetonius, On Grammarians 9
Suetonius is discussing Horace’s teacher Orbilius.
librum etiam, cui est titulus περὶ ἀλογίας, edidit continentem querelas de iniuriis, quas professores neglegentia aut ambitione parentum acciperent.
He also published a book, whose title is On Folly; it contains complaints about the injustices which teachers endured through the carelessness or vanity of parents.
The title of the book has been corrupted (‘Perialogos’) in the manuscripts. ‘Peri alogias’ (‘On Folly’) seems the easiest correction.