Original sentence: Despite these defeats, Ottoman power continued to expand.In the First Battle of Kosovo, Sultan Murat I was the first Ottoman ruler to lose his life; his successor [[Sultan Bayazid I] went on to expand Ottoman territories significantly despite defeats in Wallachia, in his siege of Constantinople, and his crushing defeat in the battle of Ankara, in which he was captured and which resulted in a civil war for the succession.It seems unlikely that single battles could seriously have affected the rise of Ottoman power.The Second Battle of Kosovo might have had more significance in that there were two powers simultaneously resisting the Ottomans (the Hungarians under Hunyadi and the Albanians under Skanderbeg), with Skanderbeg only narrowly missed joining Hunyadi for the battle.The overall significance of these battles (within their medieval context) remains disputed, although the First Battle of Kosovo has become, for Serbians since their independence at least, a national symbol for heroism and an admirable 'fight against all odds', and may therefore have assumed a significance that it lacked.While the resistance of the Byzantines, Serbians, Hungarians, Albanians and Wallachians should have given the Austrians (and Italians) more time to prepare for an Ottoman threat against them, it is by no means clear that they believed the threat to be serious or consciously prepared for it
Edited sentence: Although he lost the Second Battle of Kosovo, eventually Hunyadi was victorious in his resistance and defeat of the Ottomans in the Kingdom of Hungary.Both of these battles were significant in the overall resistance against the Ottoman advance through the Balkans.Both of these leaders were significant (as was Wallachian leader Vlad III Dracula) in that their resistance gave Austria and Italy greater time to prepare for the Ottoman advance.Had the Serbian and Hungarian-led coalition armies been victorious in either or both of the battles, it could have changed the course that Kosovo eventually took under the rule of the Ottoman Empire.Skanderbeg was also successful in his resistance in his home country of Albania, a cause that was lost following his death in 1468.The First Battle of Kosovo sealed the fate of the Serbian resistance, and became a national symbol for heroism and the admirable 'fight against all odds'