Richard Kilvington was an obscure fourteenth-century philosopher whose Sophismata deal with a series of logic-linguistic conundrums of a sort which featured extensively in philosophical discussions of this period. Originally published in 1990, this was the first ever translation or edition of his work. As well as an introduction to Kilvington's work, the editors provide a detailed commentary. This edition will prove of considerable interest to historians of medieval philosophy who will realise from the evidence presented here that Kilvington deserves to be studied just as seriously as Duns Scotus or William of Ockham.