Editing Władysław II Jagiełło (section)

===Challenges===
[[File:Lithuanian Denar of Jogaila with Lithuanian Vytis (Waykimas), minted in 1388–1392.jpg|thumb|upright=0.66|Lithuanian [[Denar]] of Jogaila (minted in 1388–1392) with [[Coat of arms of Lithuania|Vytis (Pahonia)]]]]
Jagiello's baptism failed to end the [[crusade]] of the Teutonic Knights, who claimed his conversion was a sham, perhaps even heresy, and renewed their incursions on the pretext that [[pagan]]s remained in Lithuania.<ref name="Jones"/><ref name="Housley"/> From then on, however, the Order found it harder to sustain the cause of a crusade and faced the growing threat to its existence posed by the Kingdom of Poland and a genuinely Christian Lithuania alliance.<ref name="Sedlar"/><ref name="turnbull"/> Władysław sponsored the creation of the [[diocese of Vilnius]] under [[bishop of Vilnius|bishop]] [[Andrzej Wasilko]], the former confessor of [[Elizabeth of Poland]]. The bishopric, which included Samogitia, then largely controlled by the Teutonic Order, was subordinated to the see of [[Gniezno]] and not to that of Teutonic [[Königsberg]].<ref name="Jones"/> The decision may not have improved Władysław's relations with the Order, but it served to introduce closer ties between Lithuania and Poland, enabling the Polish church to freely assist its Lithuanian counterpart.<ref name="Kłoczowski"/>

In 1389, Władysław's rule in Lithuania faced a revived challenge from Vytautas, who resented the power given to [[Skirgaila]] in Lithuania at the expense of his own patrimony.<ref name=Mick/> Vytautas started a [[Lithuanian Civil War (1389–1392)|civil war in Lithuania]], aiming to become the Grand Duke. On 4 September 1390, the joint forces of Vytautas and Grand Master [[Konrad von Wallenrode]] of the Teutonic Order, laid siege to Vilnius, which was held by Władysław's regent Skirgaila with combined Polish, Lithuanian and Ruthenian troops.<ref name="Bojtar"/> Although the Knights lifted the siege of the castle after a month, they reduced much of the outer city to ruins. This bloody conflict was eventually brought to a temporary halt in 1392 with the [[Treaty of Ostrów]], by which Władysław handed over the government of Lithuania to his cousin in exchange for peace: Vytautas was to rule Lithuania as the grand duke (''magnus dux'') until his death, under the overlordship of the Supreme Duke (''dux supremus'') in the person of the Polish monarch.<ref name="rowell"/> Skirgaila was moved from the [[Duchy of Trakai]] to become prince of Kiev.<ref name="stone5"/> Vytautas initially accepted his status but soon began to pursue Lithuania's independence from Poland.<ref name="Jasienica"/><ref name="Dvornik"/>

The protracted period of war between the Lithuanians and the Teutonic Knights was ended on 12 October 1398 by the [[Treaty of Salynas]], named after the islet in the [[Neman River]] where it was signed. Lithuania agreed to cede Samogitia and assist the Teutonic Order in a campaign to seize [[Pskov]], while the Order agreed to assist Lithuania in a campaign to seize [[Novgorod]].<ref name="Jasienica"/> Shortly afterwards, Vytautas was crowned as a king by local nobles; but the following year his forces and those of his ally, Khan [[Tokhtamysh]] of the [[White Horde]], were crushed by the [[Timurid dynasty|Timurids]] at the [[Battle of the Vorskla River]], ending his imperial ambitions in the east and obliging him to submit to Władysław's protection once more.<ref name="Bojtar"/><ref name="Dvornik"/>