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The answer that you seek is lots and lots of split inheritance. And for swabia lots and lots of city privilages

Kinda funny to me that the map is showing “Jülich and Berg” but no mention/coat if arms of Cologne, the yellow part in the center
Maybe the map was created for a family occasion (marriage) between members of the reigning families of the two duchies.
Edit: They were united in personal union for a very long time.



