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In page History of Poland:
"The reign of the young Władysław III (1434–44),[1] who succeeded his father Władysław II Jagiełło and ruled as king of Poland and Hungary, was cut short by his death at the Battle of Varna, during a crusade against the Ottoman Empire.[1][2] This disaster led to an interregnum of three years that ended with the accession of Władysław's brother Casimir IV Jagiellon in 1447.[citation needed]
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