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IOTL, Adolf of Nassau (https://en.wikipedia.org/wiki/Adolf_of_Germany) was chosen by the electors of the Holy Roman Empire to succeed Rudolf of Hapsburg as King of Germany because they wanted a weak ruler. So Adolf immediately set out to expand his power-base and bring former Imperial possessions back under his control.
He bought the Landgraviate of Thuringia from its' current ruler, seized the Margraviate of Meissen, which was literally ownerless. But these actions eventually led to the electors deposing him and electing Albert of Hapsburg as the new King. They clashed at the Battle of Göllheim, where Adolf was killed. But his descendants kept their hereditary lands until at least the 19th century.
What might have happened if Adolf had won the battle and Albert had either fled or been the one killed instead? Could Adolf have lasted much longer as King
Aside from Thuringia and Meissen, Adolf had married his eldest son, Rupert, to Agnes, eldest daughter of King Wenceslaus II of Bohemia. If they lived, and if Wenceslaus II and III still died as IOTL, Agnes and Rupert would be prime candidates for the Bohemia (and maybe the Polish) throne.