From travellers' descriptions, we know that the interior precinct was built a little before the end of the 14th century when the sultan Bayazit I was attacking the city. The oldest remaining part of the castle is the circular tower to the left of the draw bridge, through which the two precincts communicate, and bears the blazons of two Grand Masters: De Lastic (1437 - 1454) and de Milly (1454 - 1461). The exterior precinct is posterior to the interior, its construction began in 1495 by the Grand Master D' Aubusson, continned by D' Amboise and completed by Del Carretto in 1514. On the northen side, between the two precincts, there was a warehouse made by the knights; it was restored during the Italian occupation and today is a museum, where one can see altars, sculpures and inscriptions.