Opponents of this view argue that Shakespeare's erudition was greatly exaggerated by Victorian enthusiasts, and that the works display the typical knowledge of a man with a grammar school education of the time. His Latin is derived from school books of the era. There is no record that any contemporary of Shakespeare referred to him as a learned writer or scholar. Ben Jonson and Francis Beaumont both refer to his "lack" of classical learning. If a university-trained playwright wrote the plays, it is hard to explain the many classical blunders in Shakespeare. Not only does he mistake the scansion of many classical names, in "Troilus and Cressida" he has Greeks and Trojans citing Plato and Aristotle a thousand years before their births. Willinsky suggests that most of Shakespeare's classical allusions were drawn from Thomas Cooper’s "Thesaurus Linguae Romanae et Britannicae" (1565), since a number of errors in that work are replicated in several of Shakespeare’s plays, and a copy of this book had been bequeathed to Stratford Grammar School by John Bretchgirdle for "the common use of scholars".