The rejection of the medieval scholastic tradition that characterised the logic of the Renaissance did not imply the rejection of ancient logic. On the contrary, the philological expertise of humanist scholars made it possible to read the writings of ‘practically all classical Greek authors’.1 In particular, Aristotle’s logical writings and many commentaries on them, together with new Latin translations and revised scholastic ones, became widely available not only in manuscript form but also in print.2 This favoured a lively dialogue with ancient logical literature, even when it was tinged with criticism.