The Polish/Czech names in this TL are kinda different due to linguistic divergence.
Premyslid Century
Wenceslaus III is known for his prowess and his victory in battle, his glory has consequences and his dynasty became the rulers of Spain, the Bohemian Empire(Bohemia-Poland) and Germany, they eliminated their rivals the Habsburgs victoriously.
Important people for Wenceslaus III and Wenceslaus III himself
Wenceslaus III and his wives
Wenceslaus III(Wenceslaw/Waclaw)
The second king of the united Kingdom of Poland and Bohemia, King of Poles(Lachians) and Czechs, King of Slavs.
Kunigunde of Kuyavia(Kunegunda/Kunhuta)
The first wife of Wenceslaus III, she was a dutiful wife to Wenceslaus III despite her husband being the one who defeated his father, Vladislaus the Elbowhigh who was killed by his troops, she died after getting pregnant every year like her mother in law, Judith of Austria as soon as she was able to consummate the marriage and only three of her three children survive which are Boleslaus, Wenceslaus and Judith(Jutta/Bonne).
Constance of Sicily/ Costanza di Barcelona
The second wife of Wenceslaus III, she introduced the Italian poetry, even invited Dante in the court and introduced vegetables in the realm of her husband she and her children were expelled from her husband’s lands once the eldest son of her husband from his first wife, Boleslaus became the King of Poland-Bohemia or the Bohemian Empire, although her children were allowed to return,according to rumor she was ordered to be poisoned by the Holy Roman Emperor before she can return to the Bohemian Empire, her children are Isabella(Elisabeth), Sigismund Frederick, Anne, Catherine, Adalbert Albert(Wojciech Olbracht).
Note:
She is similar to the OTL Bona Sforza
Popular Cousins and Siblings
Anna of Bohemia
The sister of Wenceslaus III and Queen of France, the last wife of Philip IV of France and Navarre.
Elisabeth of Bohemia
Sister of Wenceslaus III and Queen of Hungary.
Wenceslaus of Plock
The designated successor of Wenceslaus III in the event he has no heirs and his favorite cousin, he is rumored to have sexual relations with Wenceslaus III due to him being a favorite in the court of Wenceslaus III.