Prince Valdemar of Denmark
Prince Valdemar of Denmark, (27 October 1858 – 14 January 1939) was the third son and youngest child of Christian IX and Louise of Hesse-Kassel.
He had a lifelong naval career.
Prince Erik, Count of Rosenborg
Prince Erik, Count of Rosenborg( Erik Frederik Christian Alexander; 8 November 1890 – 10 September 1950) was a Danish prince.
He was born in Copenhagen, a son of Prince Valdemar of Denmark and Princess Marie of Orléans.
Princess Caroline-Mathilde of Denmark
Princess Caroline- Mathilde of Denmark( 27 April 1912 – 12 December 1995) was a daughter of Prince Harald of Denmark and granddaughter of King Frederick VIII of Denmark.
As the wife of Knud, Hereditary Prince of Denmark, she became Hereditary Princess of Denmark.
Valdemar I of Denmark
Valdemar I of Denmark( 14 January 1131 – 12 May 1182), also known as Valdemar the Great, was King of Denmark from 1146 until his death in 1182.
The reign of King Valdemar I saw the rise of Denmark, which reached its zenith under his second son, and successor, King Valdemar II of Denmark.
Princess Thyra of Denmark
Princess Thyra of Denmark,,( 29 September 1853 – 26 February 1933, in Gmunden) was the youngest daughter and fifth child of Christian IX of Denmark and Louise of Hesse- Kassel.
In 1878, she married Ernest Augustus, the exiled heir to the Kingdom of Hanover.
As the Kingdom of Hanover had been annexed by Prussia in 1866, she spent most of her life in exile with her husband in Austria.
Thyra was the younger sister of Frederik VIII of Denmark, Queen Alexandra of the United Kingdom, George I of Greece, Empress Maria Feodorovna of Russia and an elder sister of Prince Valdemar of Denmark.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
Ingeborg of Denmark, Queen of France
Ingeborg of Denmark( 1174 – 29 July 1237) was Queen of France by marriage to Philip II of France.
She was a daughter of Valdemar I of Denmark and Sofia of Minsk.
Prince Aage, Count of Rosenborg
Prince Aage, Count of Rosenborg, (Aage Christian Alexander Robert; 10 June 1887 – 19 February 1940) was a Danish prince and officer of the French Foreign Legion.
He was born in Copenhagen the eldest child and son of Prince Valdemar of Denmark and Princess Marie d'Orléans.
Louise of Hesse-Kassel
Louise of Hesse-Kassel (7 September 1817 – 29 September 1898) was Queen of Denmark by marriage to King Christian IX of Denmark.
Prince Viggo, Count of Rosenborg
Prince Viggo, Count of Rosenborg(" Viggo Christian Adolf Georg"; 25 December 1893 – 4 January 1970) was a Danish prince.
He was born in Copenhagen the youngest son of Prince Valdemar of Denmark and Princess Marie of Orléans.
He was also the youngest grandson of Christian IX of Denmark.

Question: When is Prince Valdemar Of Denmark's mother's birthday?
Answer: 7 September 1817