 Alain de Libera has argued that the Summulae dialectices is typical of mature works in the philosophy of logic c. 1250 and a little later. If this is the case, can we exclude the possibility that Bacon continued teaching at some University up to ca. 1256/57? He does say that he had a reputation as a scholar and teacher up to that time. Scholars have long held that Roger Bacon was a pioneer in the introduction of the study of Aristotle as interpreted by Averroes and Avicenna to the University of Paris c. 1240. But to this we must add the name of Solomon Ibn Gebirol (Avicebron). During the past ten years or so, research has shown that two Erfurt manuscripts (Amplon. Q. 290 and Q. 312) ascribed to Walter Burley (1274/5–1344) by the Amplonius de Berka in the fifteenth century, actually belong to the first half of the thirteenth century. Rega Wood, the editor of the Physics from the Erfurt MS Amplon. Q 290, has attributed these questions on the Physics and most of the other works in these two Erfurt manuscripts to Richard Rufus of Cornwall, a contemporary and opponent of Roger Bacon [Wood 1997; Wood, IPA, 2003].