Casimir III of Poland has a son

Casimir III was the last Piast who was king of Poland. Despite having married four times he didn't have any male legitimate heir, and so he arranged for his nephew, Louis I of Hungary, to become the Polish king. Louis ascended to the throne, and also didn't have a male heir, but his daughter Jadwiga married Jogaila of Lithuania, starting the Jagiellon dynasty and the union between both countries.

But WI Casimir had fathered a son, avoiding the reigns of Louis and Jadwiga? How would affect Eastern Europe? And, just to make things a bit more complicated, let's suppose that the hoped male heir of Casimir comes only in 1368, making his last daughter from Jadwiga of Zagan (also named Jadwiga) be born a boy instead. The king dies in 1370, leaving a two-years-old child as his legitimate heir. Who would defend his rights to the throne? And what kind of political mess could happen in Poland during the regency to the child-king?
 
There would probably be some kind of a regents council with Casimir's closest advisors, like chancellor Janusz Suchywilk or archbishop of Gniezno Jarosław. Add to it some rappresentatives of Little Poland, perhaps even young king's aunt Elizabeth (mother of Louis of Anjou).
Such a council's policy would have been mostly defensive. Any war without one commander-in-chief is hard, so probably we can forget about invasion of Silesia Casimir had planned.
As far as internal policy goes, knights would wave gained some privileges, although I'm not sure if as many as Louis of Anjou gave them IOTL. Peasants' situation would have been a little worse, the same probably with burghers. The knights have more military and political power.
Anyway, not so many changes in external policy, more in internal. Untill young king is old enough to rule, Poland probably limits her actions to defensive ones. After that... Poland is still more interested in pushing west and north (Silesia and western Pomerania) against the Luxemburgs. OTOH, Luxemburgs are allied to the Teutonic Order, so Poland need to deal with the Order too. I think that Polish-Lithuanian alliance might happen (and baptism of Lithuania, necessary as removing the Order's reason of existence). But only that, an anti-Order alliance. No personal union, nothing like that.
And then there is a question - whom to take out first. I think Poland would go against the Order first, because only so Poles can count on Lithuanian help. When (and IF) the Order's power is broken, Poland turns west to reclaim Silesia and Pomerania, to incorporate them or make them Polish vassals.
Of course assuming the young king doesn't die as a child, is not an imbecile and regents are competent (Casimir's advisors were, so was Elizabeth).
 
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