Oscar I (born Joseph François Oscar Bernadotte; 4 July 1799 – 8 July 1859) was King of Sweden and Norway from 1844 to his death. He was the second monarch of the House of Bernadotte.

Oscar was born at 291 Rue Cisalpine in Paris (today: 32 Rue Monceau), the only child of Jean-Baptiste Jules Bernadotte, then-French Minister of War and Sovereign Prince of Pontecorvo, and Désirée Clary, Napoleon Bonaparte's former fiancée. He was named Joseph after his godfather Joseph Bonaparte, who was married to his mother's elder sister Julie, but was also given the names François Oscar. The latter name was chosen by Napoleon after one of the heroes in the Ossian cycle of poems. Désirée is said to have chosen Napoleon to be Oscar's godfather.

On 21 August 1810, Oscar's father was elected heir-presumptive to the Swedish throne by the Riksdag of the Estates, as King Charles XIII was without legitimate heirs. On the day of the royal adoption of his father, Oscar was created Duke of Södermanland and accorded the style of Royal Highness. Oscar and his mother moved from Paris to in June 1811; while Oscar quickly acquired the Swedish language, Désirée had difficulty adjusting to life at the Swedish court and despised the cold weather. Subsequently, she left Sweden in the summer of 1811 and would not return until 1823.

...
Wikipedia