From the Greek and Roman age to the Byzantine era and from the Venetian domination to the Ottoman Empire, Modon has been a commercial and military crossroads of varying importance, depending on the historic period. It reaches its climax in the years of the Venetian rule, when most of its fortifications are erected Surprising enough, the military architecture of the castle has not been dated as yet. This article puts an end to this lack and offers precious new conclusions about the fortress of Modon, which has played an important role in the history of the Mediterranean.