This, in combination with the emergent Turkish threat, particularly after the Fall of Constantinople in 1453, and the continuous pirate raids, forced the Venetians to fortify the island.
Este feito, en combinación coa ameaza de Turquía de utilizar a pólvora con fins bélicos, sobre todo logo da ocupación de Constantinopla en 1453, e os continuos ataques de piratas, obrigou aos venecianos a fortificar a illa.