 The crusaders took Constantinople on April 13, 1204.They gave the imperial throne to Baldwin IX of Flanders who was ceremoniously crowned on May 16, 1204, but William of Champlitte joined to Boniface of Montferrat who became king of Thessalonica under the new emperor.According to the "Partitio Romaniae", a treaty concluded by all the leaders of the Fourth Crusade, the Republic of Venice received title to occupy, among other territories, the whole Peloponnese (in modern Greece).