Princess Märtha of Sweden in the context of "Baudouin of Belgium"

Harald V (Norwegian: Harald den femte, Norwegian pronunciation: [ˈhɑ̂rːɑɫ dɛn ˈfɛ̂mtə]; born 21 February 1937) is King of Norway, reigning since 1991.

A member of the House of Glücksburg, Harald was the third child and only son of King Olav V of Norway and Princess Märtha of Sweden. He was second in the line of succession at the time of his birth, behind his father. In 1940, as a result of the German occupation during World War II, the royal family went into exile. Harald spent part of his childhood in Sweden and the United States. He returned to Norway in 1945, and subsequently studied for periods at the University of Oslo, the Norwegian Military Academy, and Balliol College, Oxford. A keen sportsman, Harald represented Norway in sailing at the 1964, 1968, and 1972 Olympic Games, and later became patron of World Sailing.

Olav V (Norwegian: Olav den femte, Norwegian pronunciation: [ˈûːlɑːv dɛn ˈfɛ̂mtə]; born Prince Alexander of Denmark; 2 July 1903 – 17 January 1991) was King of Norway from 1957 until his death in 1991.

Olav was born at Sandringham House in England, the only child of Prince Carl of Denmark and Princess Maud of Wales. He became heir apparent to the Norwegian throne when his father was elected King Haakon VII of Norway in 1905. He was the first heir to the Norwegian throne to be brought up in Norway since Olav IV in the 14th century, and his parents made sure that he was given as Norwegian an upbringing as possible. In preparation for his future role, he attended both civilian and military schools. In 1929, he married his first cousin, Princess Märtha of Sweden. During World War II, his leadership was much appreciated, and he was appointed Norwegian Chief of Defence in 1944. Olav became king following the death of his father in 1957.

Astrid of Sweden (Astrid Sofia Lovisa Thyra; 17 November 1905 – 29 August 1935) 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.

Astrid and Leopold had three children. Their daughter, Joséphine-Charlotte, later became the Grand Duchess Consort of Luxembourg, while their sons both ascended the throne as King of the Belgians. Their son King Albert II named his first daughter, Princess Astrid of Belgium, after his mother. Queen Astrid was the sister of Crown Princess Märtha of Norway (the wife of the future King Olav V).

Princess Astrid, Mrs. Ferner (Astrid Maud Ingeborg; born 12 February 1932) is the second daughter of King Olav V and his wife, Princess Märtha of Sweden. She is the older sister of King Harald V of Norway and younger sister of the late Princess Ragnhild. She became the “first lady” of Norway during the reign of her grandfather, Haakon VII, after her mother’s death in 1954, and continued in this role during her father’s reign until her brother married in 1968.