Editing Władysław II Jagiełło (section)

===Early actions===
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On 22 June 1399, Jadwiga gave birth to a daughter, baptised [[Elizabeth Bonifacia of Poland|Elizabeth Bonifacia]], but within a month the mother and daughter died, leaving Władysław sole ruler of the Kingdom of Poland and without an heir nor much legitimacy to rule the kingdom. Jadwiga's death undermined Władysław's right to the throne, and as a result old conflicts between the nobility of [[Lesser Poland]], generally sympathetic to Władysław, and the gentry of [[Greater Poland]] began to surface. In 1402, Władysław answered the rumblings against his rule by marrying [[Anna of Cilli]], a granddaughter of [[Casimir III of Poland]], a political match that re-legitimized his reign.{{cn|date=March 2024}}

The [[Union of Vilnius and Radom]] of 1401 confirmed the status of Vytautas as grand duke under Władysław's overlordship while assuring the title of grand duke to the heirs of Władysław rather than those of Vytautas: should Władysław die without heirs, the Lithuanian [[boyar]]s were to elect a new monarch.<ref name="Jasienica-103"/><ref name="stone-11"/> Since no heir had yet been produced by either monarch, the implications of the union were unforeseeable, but it forged bonds between the Polish and Lithuanian nobility and a permanent [[defensive alliance]] between the two states, strengthening Lithuania's hand for a new war against the Teutonic Order in which Poland officially took no part.<ref name="Sedlar"/><ref name="Dvornik"/> While the document left the liberties of the Polish nobles untouched, it granted increased power to the boyars of Lithuania, whose grand dukes had till then been unencumbered by checks and balances of the sort attached to the Polish monarchy. The Union of Vilnius and Radom therefore earned Władysław a measure of support in Lithuania.<ref name="Jasienica"/>

In late 1401, the new war against the Order overstretched the resources of the Lithuanians, who found themselves fighting on two fronts after uprisings in the eastern provinces. Another of Władysław's brothers, the malcontent [[Švitrigaila]], chose this moment to stir up revolts behind the lines and declare himself grand duke.<ref name="Housley"/> On 31 January 1402, he presented himself in [[Malbork|Marienburg]], where he won the backing of the Knights with concessions similar to those made by Jogaila and Vytautas during earlier leadership contests in the Grand Duchy.<ref name="Jasienica-103"/>