Ladislaus III (king of Poland)
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 Varna. In 1447 his younger brother was elected to succeed him as Casimir IV.
"Ladislaus III (king of Poland)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (April 24, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ladislaus-iii-king-poland
"Ladislaus III (king of Poland)." The Columbia Encyclopedia, 6th ed.. . Retrieved April 24, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ladislaus-iii-king-poland