Abstract: Fifteenth-century rhetoricians inherited from the Middle Ages the belief that Cicero was the author of the work generally known as the Rhetorica ad Herennium. This assumption was challenged in 1491 in a short Quaestio by Raffaele Regio (1440?-1520). He refutes the three main arguments advanced for Cicero's authorship, but in the end declares that he will leave the matter undecided. Regio's claims did not settle the matter, which was still being debated two centuries later.
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