It was untouched when the city fell to Alexander the Great in 334 BC and still undamaged after attacks by pirates in 62 and 58 BC. It stood above the city's ruins for sixteen centuries. Then a series of earthquakes shattered the columns and sent the bronze chariot crashing to the ground. By AD 1404, only the base of the Mausoleum was still recognizable.
The Knights of St John of Rhodes invaded the region and built Bodrum Castle (Castle of Saint Peter). When they decided to fortify it in 1494, they used the stones of the Mausoleum. This is also about when "imaginative reconstructions" of the Mausoleum began to appear.[25] In 1522, rumours of a Turkish invasion caused the Crusaders to strengthen the castle at Halicarnassus (which was by then known as Bodrum) and much of the remaining portions of the tomb were broken up and used in the castle walls. Sections of polished marble from the tomb can still be seen there today. Suleiman the Magnificent conquered the base of the knights on the island of Rhodes, who then relocated first briefly to Sicily and later permanently to Malta, leaving the Castle and Bodrum to the Ottoman Empire.