Charles III Johan

(1763 –1844), born Jean Bernadotte, was King of Sweden (as Charles XIV John) and King of Norway (proclaimed as Charles XIV John, but in recent times referred to accurately in Norway as Charles III John) from 1818 until his death in 1844.
Born in Pau in southern France, he joined the French Royal Army in 1780. Following the outbreak of the French Revolution, he exhibited great military talent, rapidly rising through the ranks. He served with distinction in Italy and Germany, and was briefly Minister of War. His relationship with Napoleon was turbulent; nevertheless, Napoleon named him a Marshal of the Empire on the proclamation of the French Empire. Bernadotte played a significant role in the French victory at Austerlitz.
In 1810, Bernadotte was unexpectedly elected the heir-presumptive to the childless King Charles XIII of Sweden. He assumed the name Charles John and became the de facto regent and head of state. In 1813, following the sudden unprovoked French invasion of Swedish Pomerania, Crown Prince Charles John aligned Sweden with Napoleon’s enemies in the Sixth Coalition, wherein he authored the Allied campaign plan, and commanded the Allied Army of the North that made the decisive attack on the last day of the catastrophic French defeat at Leipzig. He went on to defeat Denmark and forced Norway into a union with Sweden.
Upon the death of Charles XIII in 1818, Charles John ascended to the throne as the first monarch from the House of Bernadotte. He presided over a period of peace and prosperity, and reigned until his death in 1844.
(Source: Wikipedia)