Question: In which period the father of Queen Anne-Marie reign Denmark?
Context: Hellenic College of London was a bilingual school in Knightsbridge, London.  It was founded in 1980 by former King Constantine and Queen Anne-Marie of Greece, and closed in 2005. Princess Benedikte of Denmark, Princess of Sayn-Wittgenstein-Berleburg {'1': ", '2': ", '3': 'RE, SKmd, D.Ht. ', '4': "} (Benedikte Astrid Ingeborg Ingrid, born 29 April 1944) is the second daughter of King Frederick IX of Denmark and Ingrid of Sweden.  She is the younger sister of the reigning Queen of Denmark, Margrethe II, and the older sister of Queen Anne-Marie of Greece. Anne-Marie, Lady Byrne is a fictional character in the BBC medical drama "Holby City", portrayed by actress Jane Asher.  The character first appeared on 10 May 2007 in episode "After the Fall" - series 9, episode 30 of the programme.  After several guest appearances as the mother of established character Joseph Byrne throughout series 9 and 10, Asher signed a three-month contract to become a series regular from May 2008 onwards, for a period of 10 episodes.  Her initial storyline saw her son's girlfriend, Jac Naylor, embark on an affair with Anne-Marie's husband and Joseph's father, Lord Byrne - eventually culminating in his death, and leaving the character a widow.  Upon her return to the programme, she takes over Lord Byrne's position as Executive Chairman of the Byrne Foundation - a charity committed to research into Cardiac Valve Disease. Pavlos, Crown Prince of Greece, {'1': ", '2': ", '3': 'RE', '4': "} (Greek: Παύλος ; born 20 May 1967) is the eldest son and second child of Constantine II, the last King of Greece from 1964 to 1973 and his wife, Anne-Marie of Denmark.  Pavlos was heir apparent to the throne of Greece and was its crown prince from birth, remaining so during his father's reign until the monarchy's abolition. Princess Lilian of Sweden, Duchess of Halland (born Lillian May Davies, later Craig; 30 August 1915 – 10 March 2013), was a Welsh fashion model who became a member of the Swedish royal family through her 1976 marriage to Prince Bertil, Duke of Halland (1912–1997).  As such, she was a paternal aunt of King Carl XVI Gustaf of Sweden (although not until after his grandfather's death, which enabled her to marry Prince Bertil) and a maternal aunt of Queen Margrethe II of Denmark and Queen Anne-Marie of Greece. Prince Bertil of Sweden, Duke of Halland (Bertil Gustaf Oskar Carl Eugén; 28 February 1912 – 5 January 1997), was a Swedish royal prince and the third son of King Gustaf VI Adolf of Sweden and his first wife, Princess Margaret of Connaught.  He was the paternal uncle of King Carl XVI Gustaf of Sweden, a maternal uncle of Queen Margrethe II of Denmark and Queen Anne-Marie of Greece through his sister, the late Queen Ingrid of Denmark ("née" Princess Ingrid of Sweden). Frederick IX (Christian Frederik Franz Michael Carl Valdemar Georg; 11 March 1899 – 14 January 1972) was King of Denmark from 1947 to 1972. Queen Anne-Marie of Greece, (Greek: Άννα-Μαρία ] , born Princess Anne-Marie of Denmark on 30 August 1946) is the wife of King Constantine II, who reigned from 1964 until 1973. Princess Nathalie of Sayn-Wittgenstein-Berleburg (Nathalie Xenia Margrethe Benedikte; born 2 May 1975, in Copenhagen, Denmark) is the youngest daughter of Prince Richard of Sayn-Wittgenstein-Berleburg and Princess Benedikte of Denmark and niece of Queen Margrethe II of Denmark and Queen Anne-Marie of Greece. The Greek royal family (Greek: Ελληνική Βασιλική Οικογένεια) is a branch of the House of Glücksburg that reigned in Greece from 1863 to 1924 and again from 1935 to 1973.  Its first monarch was George I, the second son of King Christian IX of Denmark.  He and his successors styled themselves "Kings of the Hellenes".  Most members of the dynasty (aside from the last king to reign, Constantine II and his queen consort, Anne-Marie of Denmark) hold the title "Prince or Princess of Greece and Denmark" with the style "Royal Highness", except Marina, Consort of Prince Michael, and their daughters Princess Alexandra and Princess Olga.
Answer: 1947 to 1972