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Polish king who tried to strengthen royal power.
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John I Albert issued the Piotrk
John I Albert led a military expedition into Moldavia to place his brother Sigismund on the Moldavian throne. The campaign ended in disaster at the Battle of the Cosmin Forest, where the Polish army was ambushed and defeated by Moldavian and Ottoman forces.
John I Albert prepared for war against the Teutonic Order but died suddenly before any major engagement. His death left the conflict unresolved and weakened the Polish position in Prussia.
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