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Following the arrival of the Moors in Spain, the city became known as "Rabita Rutta" ("watchtower of Rota"), from which it derives its present name. In 1217 the city was raided by a group of Frisian Crusaders en route to the Holy Land. From 1248 onwards, the Moors were gradually expelled from Spain, and the city became Christian. In 1297, Sancho IV awarded the town to Alonso Pérez de Guzmán in honour of his defence of Tarifa. Later, Pérez de Guzmán gave it to his daughter, Isabel, as a wedding present when she married Fermin Ponce de León, Maestre of Alcántara and First Lord of Marchena. Construction of the "Castillo de la Luna" (Castle of the Moon) had begun in 1295, two years prior to the bequest to Pérez de Guzmán, as part of Sancho IV's effort to develop strong coastal defenses, especially near the entrance to the Mediterranean Sea. During the Middle Ages, the town was an important port for trading with North Africa. In 1780 the 11th Duke of Arcos died without issue, and the city was rendered to the Duke of Osuna.