Book of Hours (Use of Rouen): fol. 4r, c. 1470. In the late 1400s and early 1500s Rouen was an established and important center of book production. The city?s cathedral had a wealthy chapter that spent large sums of money to commission books and to maintain its extensive library. The stationers and booksellers would have likely been concentrated in or near the cathedral precinct. This artist, named after a manuscript now in Geneva, was Rouen?s principal illuminator during the second half of the 1400s.