Charles XIV and III John, also known as Carl John, (Swedish and Norwegian: Karl Johan; January 26, 1763 – March 8, 1844) is King of Sweden (as Charles XIV John) and King of Norway (as Charles III John) from 1818 until his death, and serves as de facto regent and head of state from 1810 to 1818.

He is also the Sovereign Prince of Pontecorvo, in south-central Italy, from 1806 until 1810.

He was born Jean Bernadotte in France and serves a long career in the French Army.

He subsequently acquires the full name of Jean-Baptiste Jules Bernadotte.

He is appointed as a Marshal of France by Napoleon, though the two have a turbulent relationship.

Napoleon makes him Prince of Pontecorvo on June 5, 1806, but he stops using that title in 1810 when his service to France ends and he is elected the heir-presumptive to the childless King Charles XIII of Sweden.

His candidacy is advocated by Baron Carl Otto Mörner, a Swedish courtier and obscure member of the Riksdag of the Estates.

Upon his Swedish adoption, he assumes the name Carl.

He does not use the name Bernadotte in Sweden, but founds the royal dynasty there of that name.