Baudouin was King of the Belgians from 17 July 1951 until his death in 1993. He was the last Belgian king to be sovereign of the Congo, before it became independent in 1960 and became the Democratic Republic of the Congo.

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.