The literature often mentions that Peregrinus was praised by Roger Bacon, who called him a "perfect mathematician" and one who valued experience over argument. But the association of the praise with Peregrinus appears only in a marginal gloss to Bacon's Opus tertium and only in one of the five manuscripts used in the critical edition, which leads us to conclude that it was a later comment added by someone else. That Bacon's praise was for Peregrinus is open to serious debate.