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Cracow, 30 November 1427. Queen Sophia gives birth to her only daughter. Girl is named Elżbieta (Elizabeth) after her deceased half sister Elżbieta Bonifacja, oldest daughter of King Władysław Jagiełło and his first wife Jadwiga from House of Anjou.

June 1434-after death of Władysław II his only son, also named Władysław, is crowned as King of Poland, young Władysław III officially is also Supreme Duke of Lithuania, but 10 years old boy rule neither in Kingdom of Poland nor in Grand Duchy of Lithuania. Due to his young age Poland is under regency. Powerful bishop of Cracow-Zbigniew Oleśnicki, is the most important man in the Kingdom. Meanwhile Lithuanian throne is contested between Švitrigaila, Jagiełło's last living brother, and Žygimantas Kęstutaitis, brother of Vytautas. Žygimantas with Polish help prevails, but he is pro-Polish only as long as he needs Polish support against Švitrigaila, once he strenghtened his position in GDL he tries to loosen ties with Poland, but his rule does not last long. Cruel Žygimantas has many enemies...

April 1440. After death of Albert Habsburg, King of Germany, Hungary and Bohemia, Hungarian magnates invited young Władysław III to take Hungarian throne, young Jagiellon was on his way to Buda, when he was informed about assassination of Žygimantas on 20 March. Władysław decided to secure throne Lithuanian throne first. Hungary could wait*. Young king turned to the north. He arrived in Vilnius in May. Before end of that month Władysław suddenly fell ill and died after short illness, likely poisoned by opponents of union.

*IOTL Władysław send to Vilnius younger brother, later Kazimierz (Casimir IV) with intention, that brother would be his governor in Lithuania. ITTL Władysław, being only living son of Jagiełło, went to Vilnius personally. Even IOTL he hestitaded before he decided to accept Hungarian throne, and even after arriving to Buda he wanted to abandon Hungary and return to Poland, so his TTL move (Vilnius over Buda) seems very likely.
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