So I found something useful for once.

[Macilrille]

I dunno, the Swedes were definately the junior partner in that relationship. Which eventually made them rebel and the Union dissolve. Their royal family was dead, the somewhat related Meckelnburgers they had called in to rule instead eventually proved tyrants, so the Swedish high nobility almost begged Margrete I "of Denmark" (officially women could not rule then, but I do not think we have had many rulers of such competence before or after her and rule she did) to support them and become their sovereign. She eventually cememnted this with the Union of Kalmar. Too bad it did not last, had the Danish rule been more lenient the Union might still be around...

*Mecklenburgers not Meckelnburgers