"Murat was a stable boy"
Joachim Murat
Public DomainJoachim Murat - Credit: François Pascal Simon Gérard

  Joachim Murat, son of an innkeeper, had the good fortune to marry Napoleon Bonaparte's sister.  The Emperor made him King of Naples in 1808, a title he lost after the Battle of Waterloo did for his brother-in-law.

Jean-Baptiste Jules Bernadotte, one of Bonaparte's soldiers, was crowned Charles XIV, King of Sweden in 1818 after Charles XIII unexpectedly declared him heir and Crown Prince in recognition of his sympathetic treatment of Swedish prisoners in the war against Denmark.