  Historians of philosophy sometimes speak as if the medievals could not even have possessed the concept of a polyadic property—as if conceiving of relations in this way only became possible in the nineteenth and twentieth centuries, with the advent of a formal logic of relations and multiple quantification (Cf. Weinberg 1965, esp. 61–63). But this is surely mistaken.  What recent advances in logic have made possible is not the concept of a polyadic property, but merely its representation within a formal system. Moreover, as we have already seen, the notion of a polyadic predicate, from which our own concept of a polyadic property is derived, corresponds exactly to the medieval notion of a relative term.  And if that by itself weren’t enough, there is the fact that medievals habitually speak of relations in polyadic terms, explicitly comparing them to a road that runs between two cities (via), or to a palisade running between two watchtowers (inter-vallum) (Cf. Albert the Great, Liber de praedicamentis, 241a-241b; Aquinas Summa Theologiae I, q. 28, a. 4, obj. 5; and the texts of Harclay). Nor do they take themselves to be original in this regard. On the contrary, they take themselves merely to be following a suggestion of Aristotle’s in the Physics, which itself just appears to be part-and-parcel of the common sense conception of relations (see Physics III, 202b11–15). As Peter Aurieol says at one point: