Originally a monastery, during the War of the Spanish Succession, in 1707, it was converted into the Caputxins Fort, a new military facility for the city's defence. Previously, this place had been used as a forward defence for the Reina Anna and Conestable Forts in the 17th century.
The first cannon fired during the first siege of the Peninsular War (1808) was fired from this fort. In 1814, when the French troops abandoned the city, they destroyed all the fortifications and blew up the fort. In 1924, the powder magazine was rebuilt, not far from an existing magazine. The two watch towers that are still standing and can be visited also date from this time.