Ladislaus III

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Ladislaus III,

1424–44, king of Poland (1434–44) and, as Uladislaus I, king of Hungary (1440–44), son of Ladislaus II. He led two crusades against the Ottomans; the first (1443) was highly successful, but the second ended with his defeat and death in the battle of VarnaVarna
, city (1993 pop. 307,200), E Bulgaria, on the Black Sea. It is a major port and an industrial center. Manufactures include ships and boats, chemicals, electrical equipment, and textiles. Varna is also an international summer resort.
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. In 1447 his younger brother was elected to succeed him as Casimir IV.