Originally Posted by Denville
That was a very weird start to a royal dynasty.
To be fair though, that was rather typical of that era. Because after the French revolution, there were many "upstarts" on the thrones of Europe. Napoleon I himself had come from a minor aristocratic family at Corsica, but he was able to make himself emperor of France and his relatives kings of different other countries. Desiree's sister Julie, who happened to be married to one of Napoleon's brothers, became the queen of Spain. Desirée had been betrothed to Napoleon, and he would keep her under his protection even after he dumped her for another woman. Jean-Baptiste Bernadotte had rised through the ranks during the revolution, so he could become a marshall, the prince of Ponte-Corvo and finally king of Sweden and Norway.
Yet again, two things are special about the Bernadottes:
1: Their kingdom was way up in northen Europe, while all the other Napoleonic upstarts had theirs in southern Europe.
2: Their descendants are still royals to this day, which is not true for any of their peers.