 There has been considerable scholarly discussion of Buridan’s modal syllogistic. It has been asked in particular whether it corresponds to any modern system of modal logic. The most popular answer is S5 (King 1985). Some have argued that Buridan must have been thinking in terms of some kind of possible worlds model (Hughes 1989 and Knuuttila 1993). Such comparisons of course reflect the extent to which these scholars have been impressed by Buridan’s modal logic, which was without equal until the late twentieth century.(For an example of just how powerful his general logic was see Parsons 2014.)