We tell visitors that our oldest printed book is from 1490, a beautiful copy of Statham's Abridgement of English cases. This is true, but our earliest printed fragment of a leaf (as binding waste) is somewhat earlier. We have a leaf printed on vellum of a key work of medieval canon law, the Sextus Decretalium of Pope Boniface VIII.
The work was printed by Fust and Schoeffer, probably in 1465 as the first printed edition, or possibly a little later, in 1470 or 1473. Fust lent Johannes Gutenberg the money to set up his press and later sued him for it, which effectively ruined the modern inventor of printing. Fust continued to print with Peter Schoeffer, and their press was successful. Fust has been linked by some to the Faust legend, perhaps in part for his dealings and the association of the press with magic, but an obscure "magician" named Johann Faust is more likely. At least, early books from Gutenberg's press and that of Fust and Schoeffer stimulated wonder (and some displeasure among the traditional book trade).