Henry Probus does not get assasinated

If Henry IV Probus does not get assasinated in 1290 and manages to sire a son, what will happen to Poland and what would be it's foreign policy and would it have problems with Russia and Lithuania?
 
Probus was a step from Polish crown, but he still had two competitors: Przemysł II from Greater Poland (Wielkopolska) allied with Danzig Pomerania and Władysław Łokietek (the Elbow High) who in 1290 still controlled part of Lesser Poland (Małopolska). In a conflict between Probus and any of those two I would bet on the Silesian Piast, but I'm not so sure about him being capable to beat both of them at the same time. Not to mention the fact he also had to watch his back on some other Silesian dukes and Bohemians.
But let's assume that with some luck Probus managed to defeat both of his rivals. That would have given him a big part of Silesia, Greater and Lesser Poland with Cracow, probably also Kuyavia (Kujawy). Danzig Pomerania and Masovia would have been more problematic - their reunification would have been delayed, IMHO. Nevertheless, king Henry Probus would have been a ruler of a substantial state. Problem is he has to forge many duchies ino a single state. And he need a heir, or after his death everything will collapse.
As far as his foreign policy goes, I think he would have been interested in gatting access to the sea and taking rest of Silesian duchies, which might cause a conflict with Bohemia. Another problem would have been Brandenburg - however its pressure on Greter Poland and Pomeranians might be used as a unifying factor. Nothing unifies people better than a common enemy.
As far as Lithuania and Russia goes - Russia is too far and weak to pose any problem for Poland so far. Lithuanians might be more troublesome, but their raids might also be used to consolidate Probus' position - if he manages to repell them. I forsee good relations with the Teutonic Order, perhaps even Polish-Teutonic crusades against Lithuania.
 
Actually, Przemysl, Waclaw and Henryk have common enemies, I think Henryk Probus would keep Przemysl a vassal while make Wladyslaw the Elbowhigh an enemy and I think Przemysl could also give Kalisz to Henryk Probus in exchange for aiding him in defeating Wladyslaw the Elbowhigh and Przemysl being given Kuyavia while Henryk gains the rest of Lesser Poland.
 
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