In 1203, Philip II of France made Saumur part of his royal domain, and seized the castle. He buttressed the castle for further security. The castle became an official royal residence shortly thereafter, and Louis IX, the resident in 1227, built upon the fortress.[2] In the 1360s, Louis I of Anjou would later replace the round towers of the castle with octangonal towers, which still exist in the château's current form.
In 1621 the castle was converted into an army barracks. Nearly two centuries later it was converted into a state prison under Napoleon Bonaparte.
In the first part of the 20th century, the city of Saumur acquired the castle and began a restoration program to house the museum of the decorative arts. In line with the Saumur area's equestrian tradition and its famous "Cadre Noir", the castle also serves as a Museum of the Horse. The castle has a dungeon and watchtower, and houses the Musée de la Figurine-Jouet, a collection of very old toys and figurines of soldiers, kings of France, and clowns.
In 1906, the town purchased the castle from the state government, and turned it into a museum. The castle suffered damages during WWII shelling, and was restored by 1997.[4]
On 22 April 2001, part of the northern rampart collapsed and damaged the area below. The basement below the castle was stabilized during rebuilding, and the rampart's reconstruction was completed in 2007.[5]