When you mention the names of some famous battles, everybody knows which engagement you’re talking about. There’s only one “Battle of Actium,” for example, and the 1815 “Battle of Waterloo” is unlikely to be confused with any other “Battle of Waterloo” that may have taken place. That’s not always the case, though. If you want to talk about the “Battle of Megiddo,” you probably need to be a little more specific (there’s a reason the world is supposed to end at “Armageddon,” after all). The “Battle of Kosovo” is one of those cases. As far as I know, history records at least three “Battles of Kosovo”—and that’s not including an intra-Serbian clash in 1369, or the Kosovo Operations of both World War I and World War II, or the 1998-1999 Kosovo War. It’s a popular place for fighting, is my point. And it’s an especially popular place for fighting Ottomans, since the empire was a participant in all three of the “Battles of Kosovo” I just noted.
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It was Vlad Dracul II , the father of the infamous Vlad Dracula the III, who ‘hated’ Hunyadi, for similar reasons as Brankovic. Both had had to invest money and their own sons as tributes to the Ottomans ( effectively becoming hostages) since the Ottomans were literally breathing down their necks. After Dracula’s father was killed in a coup, Hunyadi championed the young Dracula’s cause in Wallachia and helped save his country from the Ottomans; for a while anyway.
In 1448, Vlad III (the coup that killed Vlad II, led by boyars with ties to Hunyadi, took place the year before) was still an Ottoman client, and in fact briefly took the Wallachian throne from Vladislav II that year with the Sultan’s help. He and Hunyadi didn’t form their alliance until a few years later.