 Moreover, Thomas must have considered Simplicius a rich source of information about ancient philosophers and their doctrines and especially about the Peripatetic tradition. Bossier (1987) and others have suggested that Thomas might have used material from the previously mentioned fragmentum Toletanum in his Commentary on Aristotle’s Metaphysics (XII 8, on concentric spheres and their different movers). There is no evidence of an early Latin translation of the other commentaries, with the possible exception of a small part of the Commentary on the Physics, which also goes back to Robert Grosseteste (Mansion 1956: 94).