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A spin-off from the Slavic Age of Exploration thread, since the POD proposed here is before 1400 and it's more focused on affairs in Europe:

Olaf II, King of Denmark and Norway, died unmarried at the age of 17. His mother would go on to conquer Sweden and initiate the Union of Kalmar.

Suppose Olaf lives, and marries one of Louis I's daughters (maybe one of the OTL daughters, maybe another born ITTL) in such a manner as to inherit the Polish throne on top of his other three. How plausible is it that such a bloated personal union could survive more than one generation?

Going forward from the union's establishment, both Denmark and Poland had preexisting squabbles with the Germans in the Baltic--the Hanseatic League for the former, the Teutonic Knights for the latter. Could the alliance of Poland and the Scandinavian kingdoms under Olaf defeat the Knights as decisively as Jagiello did, or even more? Could they, in the long run, bring the Teutonic State and Danzig into the royal territory of one of the four kingdoms?

What would Lithuania be up to while all this goes on? They too are enemies of the Teutonic Order, so presumably would be part of any grand anti-Teutonic coalition, but where would Lithuania go without Jagiello's marriage to Jadwiga?
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