Casimir IV of Poland
Casimir IV the Jagiellonian (Polish: Kazimierz Jagiellończyk, Lithuanian Kazimieras Jogailaitis) (1427 - 1492) ), of the House of Jagiello was grand duke of Lithuania from 1440 and king of Poland from 1447 until his death.
The son of king Ladislaus II (Jogaila) and younger brother to Ladislaus III, Casimir succeeded the latter after a three-year interregnum. His marriage in 1454 to Elisabeth (daughter of Albert II of Habsburg), a member of the Habsburg house as well as the granddaughter of Sigismund, Holy Roman Emperor, eventually allowed his son Ladislaus to combine the thrones of Hungary and Bohemia. The marriage also strengthened the ties between the houses of Jagiello and Habsburg. Elizabeth became known as the mother of the Jagiellonians.
That same year, Casimir was approached by the Prussians for aid against the ruling Teutonic Order, which he promised, by the act of incorporation of Prussia to Polish Kingdom; however, when the cities of Prussia rebelled against Teutons, the order resisted with the stronger power then expected, resulting in Thirteen Years' War (1454-1466). Casimir, in alliance with the Prussian Confederation, defeated the Teutonic Order taking over its capital in Malbork, which in the ensuing Second Treaty of Thorn recognised Polish sovereignty over western Province of Prussia and Warmia and the Polish crown's overlordship over eastern Prussia. A daughter, Hedwig, was married to George the Rich Wittelsbach of Bavaria. Delegates had gone to Kraków to negotiate the marriage. Their so-called Landshut Wedding (Landshuter Hochzeit) took place in Bavaria with much pomp and celebration in 1475.
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