Morro Castle (Spanish: Castillo de los Tres Reyes Magos del Morro), named after the three biblical Magi, is a fortress guarding the entrance to Havana bay in Havana, Cuba. The design was drawn up by the Italian engineer Juan Bautista Antonelli; originally under the control of Spain, the fortress was captured by the British in 1762, and was returned to the Spanish under treaty terms a year later. The Morro fortress in Havana shares its name with structures in Santiago de Cuba and the Castillo de San Felipe del Morro in San Juan, Puerto Rico. In this case, the Spanish "morro" means a rock which is very visible from the sea and therefore serves as a navigational landmark. Perched on the promontory on the opposite side of the harbor from Old Havana, it can be viewed from miles around as it dominates the port entrance. Built initially in 1589 in response to raids on Havana harbor, el Morro protected the mouth of the harbor with a chain being strung out across the water to the fort at La Punta.