The Catherine of Cleves Hours is a beautifully illustrated manuscript created in the 15th century, specifically around 1440. It is a type of devotional book known as a Book of Hours, which was popular in medieval Europe for personal prayer and reflection. This manuscript is notable for its intricate miniatures and detailed illustrations, showcasing the artistic style of the time. Commissioned by Catherine of Cleves, a noblewoman, the manuscript contains prayers, psalms, and calendars of saints. It is considered one of the finest examples of Gothic illumination, reflecting the religious and cultural values of the period. Today, it is housed in the Morgan Library & Museum in New York City.