One of the great treasures in the library is the Codex Forster, some of Leonardo da Vinci's note books. The Codex consists of three parchment-bound manuscripts, Forster I, Forster II, and Forster III, quite small in size, dated between 1490 and 1505. Their contents include a large collection of sketches and references to the equestrian sculpture commissioned by the Duke of Milan Ludovico Sforza to commemorate his father Francesco Sforza. These were bequeathed with over 18,000 books to the museum in 1876 by John Forster. The Reverend Alexander Dyce was another benefactor of the library, leaving over 14,000 books to the museum in 1869. Amongst the books he collected are early editions in Greek and Latin of the poets and playwrights Aeschylus, Aristotle, Homer, Livy, Ovid, Pindar, Sophocles and Virgil. More recent authors include Giovanni Boccaccio, Dante, Racine, Rabelais and Molière.