 This was supported with men by the Anatolian beyliks of Germiyan and Karaman, who feared a revival of Ottoman power, as well as, according to Doukas money given by the Byzantine emperor.Mustafa was thus able to gather a significant army, and in late August or early September laid siege to the Ottoman capital, Bursa.Contemporary Byzantine tradition ascribed the deliverance of Constantinople to a miraculous intervention by the Theotokos.