The Renaissance in Florence conjures images of beautiful frescoes and elegant buildings-the dazzling handiwork of the city's skilled artists and architects. But equally important for the centuries to follow were geniuses of a different sort: Florence's manuscript hunters, scribes, scholars, and booksellers, who blew the dust off a thousand years of history and, through the discovery and diffusion of ancient knowledge, imagined a new and enlightened world. At the heart of this activity, which bestselling author Ross King relates in his exhilarating new book, was a remarkable man: Vespasiano da Bisticci. Born in 1422, he became what a friend called "the king of the world's booksellers." At a time when all books were made by hand, over four decades Vespasiano produced and sold many hundreds of volumes from his bookshop, which also became a gathering spot for debate and discussion. Besides repositories of ancient wisdom by the likes of Plato, Aristotle, and Quintilian, his...