 Like virtually all medievals, Abelard thought that Aristotle’s modal syllogistic was a theory for de re modal sentences. He says very little about it in his logical works, however. In less than five pages in the Dialectica (245–249) he treats modal, oblique, and temporal syllogistic logic. Earlier in the same work, he says a little about conversion rules. He argues in both the Dialectica (195–196) and the Logica (15–16) that the conversion rules can be defended even on a de re reading, but the conversions he discusses are not modal conversions since the mode must be attached to the predicate and follow the term in the conversion, making the conversion into the conversion of an assertoric sentence. The conversions of de re modal sentences, as Abelard has defined them, do not hold, as Paul Thom has convincingly shown. (Thom 2003: 57–58.)