Gustaf VI Adolf (Oscar Fredrik Wilhelm Olaf Gustaf Adolf; 11 November 1882 – 15 September 1973) was King of Sweden from 29 October 1950 until his death in 1973. He was the eldest son of Gustaf V and his wife, Victoria of Baden. Before Gustaf Adolf acceded to the throne, he was crown prince for nearly 43 years during his father's reign. As king, and shortly before his death, he gave his approval to constitutional changes which removed the Swedish monarchy's last political powers. He was a lifelong amateur archeologist particularly interested in Ancient Italian cultures.
Gustaf Adolf married Princess Margaret of Connaught on 15 June 1905 in St. George's Chapel, at Windsor Castle. Princess Margaret was the daughter of Prince Arthur, Duke of Connaught and Strathearn, third son of Queen Victoria and Prince Albert of the United Kingdom. Gustaf Adolf and Margaret had five children:
Prince Gustaf Adolf, Duke of Västerbotten 22 April 1906-26 January 1947 (aged 40) Died in a plane crash at Copenhagen Airport; father of King Carl XVI Gustaf of Sweden
Prince Sigvard, Duke of Uppland 7 June 1907- 4 February 2002 (aged 94) later Prince Sigvard Bernadotte, Count of Wisborg
Queen Ingrid 28 March 1910-7 November 2000 (aged 90) Queen of Denmark; grandmother of King Frederik X of Denmark
Prince Bertil, Duke of Halland 28 February 1912-5 January 1997 (aged 84)
Prince Carl Johan, Duke of Dalarna 31 October 1916-5 May 2012 (aged 95) later Prince Carl Johan Bernadotte, Count of Wisborg
Crown Princess Margaret died suddenly on 1 May 1920 with her cause of death given as an infection following surgery. At the time, she was eight months pregnant and expecting their sixth child.