Question: When was the father of Prince Vincent of Denmark born?

Context paragraphs:
Margrethe II of Denmark: Margrethe II (Danish: "Margrethe 2."  , ] ; Faroese: "Margreta 2."  ; Greenlandic: "Margrethe II" ; full name: "Margrethe Alexandrine Þórhildur Ingrid"; born 16 April 1940) is the Queen of Denmark.  She is also the supreme authority of the Church of Denmark and Commander-in-Chief of the Danish Defence.  Born into the House of Glücksburg, a royal house with origins in Northern Germany, she was the eldest child of Frederick IX of Denmark and Ingrid of Sweden.  She succeeded her father upon his death on 14 January 1972, having had become heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne.  On her accession, Margrethe became the first female monarch of Denmark since Margaret I, ruler of the Scandinavian kingdoms in 1375–1412 during the Kalmar Union.  In 1967, she married Henri de Laborde de Monpezat, with whom she has two sons: Crown Prince Frederik (born 1968) and Prince Joachim (born 1969).  She has been on the Danish throne for 45 years, becoming the second-longest-reigning Danish monarch after her ancestor Christian IV.

Prince Axel of Denmark: Prince Axel Christian Georg of Denmark, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (Danish: "Prins Axel Christian Georg til Danmark"; 12 August 1888 in Copenhagen – 14 July 1964 in Copenhagen) was a Danish prince and a grandson of Christian IX of Denmark On his father's side, he was a first cousin of Christian X of Denmark, Haakon VII of Norway, Constantine I of Greece, George V of the United Kingdom, Nicholas II of Russia, Maud of Wales and Ernest Augustus III, Duke of Brunswick and on his mother's side of Henri, Count of Paris (1908–1999), Orleanist pretender to the French throne.  Prince Axel was a popular patron of sports.  He was a prominent International Olympic Committee member and activist and also a business executive.  In 1963, Prince Axel became the first honorary member of the IOC in history.  He was an officer in the Royal Danish Navy.

Princess Josephine of Denmark: Princess Josephine of Denmark, Countess of Monpezat (Josephine Sophia Ivalo Mathilda; born 8 January 2011), is the fourth and youngest child of Crown Prince Frederik and Crown Princess Mary, and the seventh grandchild of Queen Margrethe II of Denmark and her husband, Henrik, Prince Consort of Denmark.  She is the twin sister of Prince Vincent of Denmark.

Prince Vincent of Denmark: Prince Vincent of Denmark, Count of Monpezat (Vincent Frederik Minik Alexander; born 8 January 2011), is the third child and younger son of Crown Prince Frederik and Crown Princess Mary, the sixth grandchild and youngest grandson of Queen Margrethe II and Prince Henrik, and the twin brother of Princess Josephine.

Alexander Ramsay of Mar: Captain Alexander Arthur Alfonso David Maule Ramsay of Mar DL (21 December 1919 – 20 December 2000) was the only child of Princess Patricia of Connaught, who renounced her royal title and style when she married then-Captain the Hon. Alexander Ramsay in February 1919.  His mother was the youngest child of Prince Arthur, Duke of Connaught, the third son of Queen Victoria and Prince Albert.  His father was the third son of John Ramsay, 13th Earl of Dalhousie.  Alexander was the first cousin of the Queen Ingrid of Denmark, Prince Gustaf Adolf (the father of the current King of Sweden) and their siblings, because their mother, Princess Margaret of Connaught, was Alexander's aunt and wife to the Crown Prince of Sweden.

Frederik, Crown Prince of Denmark: Frederik, Crown Prince of Denmark, Count of Monpezat, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (Frederik André Henrik Christian; born 26 May 1968) is the heir apparent to the throne of Denmark.  Frederik is the elder son of Queen Margrethe II and Henrik, the Prince Consort.

Sara Petersen (badminton): Sara Runesten Petersen (born 8 May 1975) is a Denmark born female badminton player from New Zealand.

Minik (given name): Minik is a Greenlandic Inuit name meaning "viscid train oil which is being used as sealing for skin boats."  It was the third most popular name given to boys in Greenland during the past decade.  The name was given to Prince Vincent of Denmark, born in 2011, as one of his middle names.

Prince Carl Bernadotte: Carl Gustaf Oscar Fredrik Christian, Prince Bernadotte (10 January 1911 – 27 June 2003), 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.

Henry Frederick, Prince of Wales: Henry Frederick, Prince of Wales (19 February 1594 – 6 November 1612) was the elder son of James VI and I, King of England and Scotland, and his wife, Anne of Denmark.  His name derives from his grandfathers: Henry Stuart, Lord Darnley, and Frederick II of Denmark.  Prince Henry was widely seen as a bright and promising heir to his father's thrones.  However, at the age of 18, he predeceased his father when he died of typhoid fever.  His younger brother Charles succeeded him as heir apparent to the English, Irish and Scottish thrones.

Supporting paragraphs: Prince Vincent of Denmark Frederik, Crown Prince of Denmark
Answer: 26 May 1968