In medieval Europe, a collection of liturgical prayers for the use of the faithful. Books of Hours appeared in England in the 13th century, and contained short prayers and illustrations, with each prayer suitable for a different hour of the day, in honour of the Virgin Mary. The enormous demand for Books of Hours was a stimulus for the development of Gothic illumination. A notable example is the Tres Riches Heures du Duc de Berry, illustrated in the early 15th century by the Limbourg brothers. Books of Hours and contained short prayers and illustrations, with each prayer suitable for a different hour of the day, in honour of the Virgin Mary. The enormous demand for Books of Hours was a stimulus for the development of Gothic illumination. A celebrated example is the Tres Riches Heures du Duc de Berry, illustrated in the early 15th century by the Limbourg brothers.