When did the Ottomans conquer the Byzantine Emprire ?
In the early 15th century , the Peloponnese peninsula was divided between three powers : the Latin Principality of Achaea in the north and west , the Byzantine Greek Despotate of the Morea in the south and east , and Argos and Nauplia , Coron and Modon and some attendant forts , held by the Republic of Venice .