Belles Heures du Duc de Berry

The Belles Heures du Duc de Berry (Beautiful Hours of the Duke of Berry) is an early 15th-century illuminated book of hours (containing prayers to be said by the faithful at each canonical hour of the day) commissioned by the French prince John, Duke of Berry (French: Jean, duc de Berry), around 1409, and made for his use in private prayer and especially devotions to the Virgin Mary. The miniatures of the Belles Heures are mostly painted by the Limbourg brothers; very few books of hours are as richly decorated as it.

Source: Wikipedia — Belles Heures du Duc de Berry (CC BY-SA 4.0)