Edited sentence: In 1544, following the raids by the Muslim corsair, Barbarossa Kheir-ed-Din, several medieval buildings were constructed to protect the coast from the Barbary pirates who continued to attack and plunder the coastal villages.The latter was a watchtower which served to patrol the coast around Giardini Naxos; if any pirate boats were sighted, the obsevers inside the tower could alert the villagers by sending out smoke signals.These were Schisò Castle which was rebuilt from an earlier 13th century castle, and Vignazza Tower