 Aristotle’s treatment of relations in the Categories (ch. 7) and in the Metaphysics (V, ch.15) is opaque and incomplete. Because of this fact, in the Late Antiquity and in the Middle Ages many authors tried to reformulate the doctrine of relatives. Wyclif ’s attempt is one of the most interesting among those of the whole Middle Ages, as he very likely was the first medieval author able to work out a concept of relation conceived of as an accidental form which is in both the relatives at once, even though in different ways. Consequently his relation can be considered the ontological equivalent to our modern functions with two variables, or two-place predicates, whereas all the other authors of the Middle Ages had thought of the relations in terms of monadic functions. As a matter of fact, according to Wyclif, relation is different from quality and quantity, since it presupposes them just as what follows by nature presupposes what precedes. Moreover, quantity and quality are, in a certain way, absolute entities, but relation qua such is a sort of link between two things (see De ente praedicamentali, ch. 7, p. 61).