Today the fort houses the Museum of Arms (French: "Musée des armes"). Founded in 1963, it was the first museum in Morocco specializing in the history of arms and armour. Its collection includes up to 5000 pieces (only a part of which are on display) originating from 35 countries and dating from prehistory to the 20th century. The museum emphasizes the collection of Moroccan arms, and features a large number that were manufactured in Fez in the Makina, an industrial arms factory established in 1886 next to the Royal Palace in Fez. One of the notable artifacts on display is an enormous Saadian cannon that was used during the Battle of Three Kings in 1578, nearly 5 meters long and weighing around 12 tons.