 Complete the following phrase:  The last years of the fourteenth century were characterized by the increasing Turkish threat. This threat was not from the small Turkmen emirates that bordered Trebizond, but from the dynasty of the Osmanli, a new Turkish power emerging from western Anatolia that would soon consolidate the Ottoman Empire. Although their expansion was temporarily checked by Tamerlane at the Battle of Ankara in 1402, by the 1430s the Ottomans had recovered their fortunes, seizing large segments of Greece and finally capturing Constantinople itself 