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I was thinking about the scenario what if Casimir III has a son...If Casimir III has a son he will focus on his duties such as regaining Silesia, Pomerania and the other former lands of the Kingdom of Poland and there would be no union with Lithuania..however the question is how would this effect Europe in General?
I think most likely the son of Casimir III would marry a Habsburg or Jadwiga of Zagan who married Casimir III in OTL.