In January of 1469, the accounts of Duke Charles the Bold of Burgundy record a payment to the scribe Nicolas Spierinc for having written "some prayers for my lord." Seven months later, the same account notes a payment to the illuminator Lievin van Lathem for twenty-five miniatures plus borders and decorated initials in the same manuscript. In this seminal study, the late Antoine de Schryver presents an argument that the documents refer to the exquisite prayer book of Charles the Bold now in the J. Paul Getty Museum (Ms. 37)—one of Charles's most splendid commissions, belonging to the greatest era of Netherlandish Burgundian book painting. De Schryver's in-depth research opens a window onto the careers of the Van Lathem, who served three rulers of the Burgundian Netherlands over forty years, and Nicolas Spierinc, the most inventive and brilliant scribe of Charles's court. This volume reproduces all of the book's miniatures and some of its elegant calligraphic pages.