WI: Sigismund of Brandenburg becomes King of Poland?

I was just reading through some threads and posts on Protestant Poland and I came across this post (https://www.alternatehistory.com/fo...t-to-protestantism.201783/page-3#post-4747139), which lead me to this guy: https://en.wikipedia.org/wiki/Sigismund_of_Brandenburg

Apparently, before he died in 1566, his uncle, King Sigismund II Augustus of Poland considered him as a successor. What if Sigismund of Brandenburg didn't die and was elected King of Poland? This was before the Hohenzollerns converted to Calvinism. And before the Vasas, the Counter-Reformation and the Deluge, the majority of Polish Protestants were Calvinists. Lutheranism was seen as too foreign and German.

Then again, would Sigismund have even been accepted in the first place?

Any thoughts?
 
Ooh fun. Especially if somehow Sigmund marries a cousin and adds the duchy of Prussia to the PLC. Stanczyk will be turning in his grave with his whole "letting a bear out of a cage" if the bears returns willingly.
 
I wouldn't be so sure about Prussia. Even if we have Sigismund of Brandenburg as Polish king, it doesn't say he would incorporate Prussia into PLC. Stefan Batory was a duke of Transylvania and King of Poland, but Transylvania was never part of the PLC. August II and August III were both kings of Poland and of Saxony but it was strictly personal union - both Saxony and PLC remained separate states. Also, the throne was elective - there was no guarantee Sigismund's son would be his successor as King of Poland.
OTOH Sigismund might bring incorporation of Prussia as a potential argument for his son's succession, or rather his son can do that: elect me as your king, and you will get a nice province as part of PLC. If Sigismund is a good king, it might work.
 
I wouldn't be so sure about Prussia. Even if we have Sigismund of Brandenburg as Polish king, it doesn't say he would incorporate Prussia into PLC. Stefan Batory was a duke of Transylvania and King of Poland, but Transylvania was never part of the PLC. August II and August III were both kings of Poland and of Saxony but it was strictly personal union - both Saxony and PLC remained separate states. Also, the throne was elective - there was no guarantee Sigismund's son would be his successor as King of Poland.
OTOH Sigismund might bring incorporation of Prussia as a potential argument for his son's succession, or rather his son can do that: elect me as your king, and you will get a nice province as part of PLC. If Sigismund is a good king, it might work.

I was talking about what first starts out as PU - a la Lithuania and Poland - and later gets formalized (Union of Lublin style) that 'duke of Prussia' is included amongst the Polish king's titles. And even better if he (the king of Poland) has the best hereditary claim to it through his mother - the way Brandenburg claimed it OTL.
 
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