Astrid of Sweden was a member of the Swedish House of Bernadotte and later became Queen of the Belgians as the first wife of King Leopold III. Following her marriage to Leopold in November 1926, she assumed the title of Duchess of Brabant. Astrid held the position of Queen of the Belgians from 23 February 1934 until her death in 1935. Known for her charitable efforts, she focused particularly on causes related to women and children.

Carl Gustaf Oscar Fredrik Christian, Prince Bernadotte, originally Prince Carl, Duke of Östergötland, was the youngest child and only son of Prince Carl of Sweden and Princess Ingeborg of Denmark and eventually a prince of the Belgian nobility. To distinguish himself from his father, he was widely known as Carl Junior. He was the brother of Princess Margaretha of Sweden, Queen Astrid of Belgium and Crown Princess Märtha of Norway.