WI: Polish Prussia

In the 1670s, Sobieski planned to conquer Prussia (Ducal Prussia, East Prussia, Kaliningrad, etc.) through an alliance with the French. However, things did not pan out and the plans never came to anything. What if, however, the plans had succeeded and Poland had conquered Prussia. How would owning Prussia affect Polish politics? Would Sobieski be able to use Prussia to reform Poland or keep his family in control of the Kingship?
 
He need to succeede in making absolutist coup first, nobles wanted their estates in Podolia back, Prussia was not first priority for them.
 
I really can't see any one family keeping its grip on the Polish crown for very long in the 17th Century. Major changes should happen for this to be true.

Sobieski needs a major advantage over the other nobles so that his family becomes the default go-to dynasty for Polish kings. Owning the whole of Prussia could help, certainly, but how could he get the nobles' support in the Prussian invasion? If he did get the nobles to support the attack, he would have to promise them lands there, thus mostly negating his family's advantage.

I can see Sobieski fighting for another crown outside of the Rzeczpospolita, but which one is a different matter entirely.
 
It might help to have Ducal Prussia revert to the Polish Crown like it was supposed to under one of the Sigismunds.
 
It might help to have Ducal Prussia revert to the Polish Crown like it was supposed to under one of the Sigismunds.

The problem with Polish Prussia, are the Prussians, they had no wish to come under Polish rule and they would fight hard to keep the Poles out. When we mix that with the fact that their rule had large domains elsewhere and Poland not having a lot of friends. I suspect that a Polish invasion of Prussia in 1670 would result in Sweden joining Brandenburg in a war with Poland, and I wouldn't be surprise if that resulted in Russia also deciding to attack Poland. Denmark would likely join on the Polish side by invading Sweden. But at the end I expect this conflict either ending up as a Brandenburg-Swedish-Russian victory or a status quo peace, maybe with a few small border changes.
 
It would be easier for Poland to annex Prussia during John Casimir's reign. If 1656 Battle of Warsaw ends with Polish victory, Elector could be captured by Poles and forced to renounce his rights to Prussia for his treason. Still, best way for Polish Prussia IMHO is different Albrecht Friedeich of Prussia (1553-1618) not suffering from menthal ilness, decides to convert to Catholicism and run for Polish Crown after death of his cousin Sigismund Augustus.
 
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TruthfulPanda

Gone Fishin'
best way for Polish Prussia IMHO is different Albrecht Friedeich of Prussia (1553-1618) not suffering from menthal ilness, decides to convert to Catholicism and run for Polish Crown after death of his cousin Sigismund Augustus.
Was it possible for Sigismund III denying Prussia to John Sigismund after Albrecht Friedrich's death?
I've read somewhere that at the expiration of the dynasty Prussia was to revert to the PLC Crown?
 
Awww, I saw the title and then realized a 800s POD was out of the question. The Prussians were a Baltic people that looked into East francia (Germans basically), decided they like it and started stealing their diet, language, relgion, and basically culture
 
Was it possible for Sigismund III denying Prussia to John Sigismund after Albrecht Friedrich's death?
I've read somewhere that at the expiration of the dynasty Prussia was to revert to the PLC Crown?
Sure he could do it. He preferred to give it to Brandenburgian Hohenzollerns for short time gains.

There was like half a dozen opportunities for Poland to take over Prussia, with little opposition from the locals - on the contrary, for Prussian estates Cracow and later Warsaw were preferential to Berlin at the time.
 
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