If you're seeing this message, it means we're having trouble loading external resources on our website. The book of hours are small personal prayer books popular during the medieval times. The Limbourg brothers finished work on the “Belles Heures” around 1409—this was to be their only complete work. The Duke of Berry then commissioned another devotional book in 1411 or 1412, which would become the Très Riches Heures du Duc de Berry (The Very Rich Hours of the Duke of Berry)—probably the best-known example of Gothic illumination. It is a book of hours: a collection of prayers to be said at the … The Très Riches Heures du Duc de Berry (French pronunciation: [tʁɛ ʁiʃz‿œʁ dy dyk də bɛʁi]) or Très Riches Heures, (English: The Very Rich Hours of the Duke of Berry), is the most famous and possibly the best surviving example of manuscript illumination in the late phase of the International Gothic style. The Limbourg Brothers, Very Rich Hours of the Duc de Berry, book of hours, 1413-16, January, colors and ink on vellum, International Gothic style. by Christine M. Bolli.