Carl XVI Gustaf (full name: Carl Gustaf Folke Hubertus, born 30 April 1946) is the reigning King of Sweden since 15 September 1973, succeeding his grandfather King Gustaf VI Adolf. He is the only son of the late Prince Gustaf Adolf, Duke of Västerbotten, who died in 1947, and Princess Sibylla of Saxe-Coburg and Gotha. The King's heir apparent, upon passage on 1 January 1980 of a new law establishing absolute primogeniture (the first such law passed in European history), is Crown Princess Victoria, the eldest child of the King and his wife, Queen Silvia. He is also 203rd in the line of succession to the British and other Commonwealth thrones.