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https://en.wikipedia.org/wiki/Stephen_B%C3%A1thory
Vladislav of Transylvania and later crowned King of the Polish-Lithuanian Commonwealth. His ultimate aim was to build a powerful independent nation inlcuding Hungary.
By being crowned king he'd unite Hungary with Transylvania and the Commonwealth thus creating turning Central Europe into a single powerful nation.
How could he accomplish this?
When do you guess the time he succeeds? (the year)
How would this change the history of Central Europe?
For the purpose of the debate we assume that Stephen Báthory can live as long as possible and he can get the support of the nobility (albeit ideas explaining how this happens are more than appreciated).