The final major factor in the development of Modern English was the advent of the printing press, one of the world’s great technological innovations, introduced into England by William Caxton in 1476 (Johann Gutenberg had originally invented the printing press in Germany around 1450). The first book printed in the English language was Caxton's own translation, “The Recuyell of the Historyes of Troye”, actually printed in Bruges in 1473 or early 1474. Up to 20,000 books were printed in the following 150 years, ranging from mythic tales and popular stories to poems, phrasebooks, devotional pieces and grammars, and Caxton himself became quite rich from his printing business (among his best sellers were Chaucer’s “Canterbury Tales” and Thomas Malory’s “Tales of King Arthur”). As mass-produced books became cheaper and more commonly available, literacy mushroomed, and soon works in English became even more popular than books in Latin.