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.
 
Long live Queen Elizabeth (or rather her future husband)? Given that this is Poland, anything can happen, though.
 
After death of Władysław his uncle Švitrigaila and cousin Mykolas (Michael) son of murdered Žygimantas started their struggle for Lithuanian throne. Meanwhile Polish throne also was contested. Two main candidates were Bolesław IV of Warsaw-member of Mazovian branch of ancient Polish dynasty (not called 'Piasts' yet) and Frederick Hohenzollern, son of Elector of Brandenburg, who was bethroded to Władysław III's older half sister Hedwig, who died in 1431. In the case of childless death of Jogaila's son Frederick was recognized as potential heir even after Hedwig's death.
 
Frederick Hohenzollern was elected as new King of Poland after months of interregnum starting Polish-Brandenburg dynastic* union. Frederick could soon gain another throne-fraction of Hungarian magnates unhappy with infant on the throne (ITTL without Władysław to claim the throne Ladislaus the Posthumous is King of Hungary under regency) proposed him Hungarian throne. But Frederick was too busy elsewhere to secure Crown of St. Stephen-his attention is concentrated in the East. In Lithuanian Civil War Poles once again fight againts Švitrigaila, this time in favor of Mykolas. Mykolas promised to recognise King of Poland as Supreme Duke, just like his father, and just like father would remain pro-Polish only as long as he needs Polish support. Meanwhile Frederick to strenghten his claim decided to marry Elizabeth, sister of Władysław III. Elizabeth reminded him her deceased sister Hedwig, who still appeared as an angel in Frederick's dreams**. Queen mother Sophia would once again see her child on the throne.

* Personal union between Poland and Brandenburg at this point could be a bit problematic, so I decided to make John the Alchemist competent for purpose of this TL, he is Elector of Brandenburg ITTL.

** That is OTL fact.
 
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So after death of Elector Frederick I his oldest son John inherits Brandenburg and title of Elector, second son-Frederick, King of Poland, inherits Kulmbach, Albert Achilles gets Ansbach like IOTL. Lithuanian Civil War ends with Švitrigaila being defeated once again and forced to recognise rule of Mykolas Žygimantaitis. Once Švitrigaila dies in 1452 Mykolas feels safe enough to break any ties with Poland and try to reclaim disputed Ruthenian areas by force, he starts talks with Hungarians about alliance against Poland and Hungarian-Lithuanian partition of Red Ruthenia, not even mentioning talks with good friends of his rival Švitrigaila-Teutonic Knights, always happy when there is occassion to create troubles for Poles. In meantime House of Hohenzollern is growing-Queen Elizabeth decade of her marriage with Frederick has given birth to 4 sons (Władysław the Older 1444-1449, Fryderyk 1446-1448, Jan, b. 1447, Władysław the Younger b. 1451)- and daughter (Jadwiga b. 1449). Meanwhile Elector of Brandenburg John has two children with his second wife Catherine of Saxony*-son Friedrich (b. 1446) and daughter Katharina (b. 1450).

* Catherine was IOTL wife of Frederick the Iron, ITTL John the Alchemist is widowed around 1440 so he could remarry and have male issue, so Polish-Brandenburg PU would still not happen in next generation.
 
I was looking forward to the King of Poland controlling the Electorate of Brandenburg....
Hohenzollern branches from Poland and Brandenburg would intermarry in the future like Spanish and Austrian Habsburg did, sooner or later could unite. I'm thinking about adding at least Sweden to collection of Hohenzollern realms to change Baltic into Hohenzollern lake.
 
Hohenzollern branches from Poland and Brandenburg would intermarry in the future like Spanish and Austrian Habsburg did, sooner or later could unite. I'm thinking about adding at least Sweden to collection of Hohenzollern realms to change Baltic into Hohenzollern lake.
That's a fun idea.
 
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