When in the early nineteen-sixties Geach presented his by now well known theory of the semantic roles of anaphoric pronouns, he did something quite unusual in those days: time and again he critically referred to certain medieval approaches to the same subject. He thought, apparently, that these sophisticated approaches showed the enormous difficulties a coreferential approach was bound to lead into. Geach (1960) even went so far as to claim sweepingly that "the medievals who discussed relativa — pronouns with antecedents — were groping in the dark despite all their ingenuity." It is one of the ironies of the history of philosophy that one such medieval theory — to be found in the fourteenth-century philosopher Buridan and his pupils (though foreshadowed a century earlier) — has now raised his head again in the work of Gareth Evans — this time against Geach.