 Complete the following phrase:  Finally the Empire of Nicaea returned Didymoteicho to Byzantine control by capturing it around 1243, during the reign of John III Doukas Vatatzes. In 125556, Theodore II Laskaris used the city as a base of operations for his campaigns against Bulgaria. The city was once again the centre of military operations in 1306, when Michael IX Palaiologos campaigned against the Catalan Company, and again during the 