a Prince of Sweden with the style of Royal Highness, and further accorded the title of Duke of Södermanland. Oscar and his mother moved from Paris to Stockholm in June 1811; while Oscar soon acclimated to life at the royal court, quickly acquiring the Swedish language, Désirée had difficulty adjusting and despised the cold weather. Consequently, she left Sweden in the summer of 1811, and would not return until 1823. Oscar, who was accompanied to Sweden by Le Moine, immediately got a teacher of Swedish and was soon able to serve as his father's interpreter. On 17 January 1816, Oscar was elected an honorary member of the Royal Swedish Academy of Sciences, and in 1818 was appointed chancellor of Uppsala University, where he spent one semester. Oscar became Crown Prince in 1818 upon the death of his adoptive grandfather, and the accession of Charles John to the Swedish and Norwegian thrones. Marriage and issue Seeking to legitimise the new Bernadotte dynasty, Charles XIV John had selected four princesses as candidates for marriage, in order of his priority: Vilhelmina of Denmark (born 18 January 1808), daughter of Frederick VI of Denmark and Marie Sophie of Hesse-Kassel (ultimately she married first Frederick VII of Denmark and second Karl, Duke of Schleswig-Holstein-Sonderburg-Glücksburg) Josephine of Leuchtenberg (born 14 March 1807), daughter of Eugene, 1st Duke of Leuchtenberg and Augusta of Bavaria, and granddaughter of the Empress Josephine. Marie of Hesse-Kassel (born 6 September 1804), daughter of William II, Elector of Hesse and Augusta of Prussia (ultimately she married Bernard II of Saxe-Meiningen) Marie of Saxe-Weimar-Eisenach (born 3 February 1808), daughter of Charles Frederick I of Saxe-Weimar and Maria Pavlovna of Russia (ultimately she married Prince Charles of Prussia) Oscar would eventually marry Josephine, first by proxy at the Leuchtenberg Palace in Munich on 22 May 1823 and in person at a wedding ceremony conducted in Stockholm on 19 June 1823. The couple had five children: King Charles XV & IV (1826–1872) Prince Gustaf, Duke of Uppland (1827–1852) King Oscar II (1829–1907) Princess Eugenie (1830–1889) Prince August, Duke of Dalarna (1831–1873) Oscar also had two extramarital sons (unofficially called the Princes of Lapland) by actress Emilie Högquist: Hjalmar Högquist, born 18 June 1839 in Hamburg, died 1874 in London. Max Högquist, born 12 August 1840 in Stockholm, died 1872 in China. By Countess Jaquette Löwenhielm (née Gyldenstolpe) Oscar had a premarital daughter: Oscara Hilder née