Ingeborg of Mecklenburg-Schwerin
Ingeborg of Mecklenburg( 1343/45 – 25 July 1395) was a daughter of Albert II, Duke of Mecklenburg and his wife, Euphemia of Sweden.
Euphemia was a daughter of Ingeborg of Norway, who was the only legitimate child of King Haakon V of Norway.
Thus, Ingeborg of Mecklenburg was Haakon V's great- granddaughter.
In 1360, she married Louis VI" the Roman" of Bavaria; she was his second wife.
The marriage remained childless.
After Louis's death, she married Henry II, Count of Holstein- Rendsburg.
They had at least four children:
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.
Maud of Wales
Maud of Wales, (Maud Charlotte Mary Victoria; 26 November 1869 – 20 November 1938) was Queen of Norway as spouse of King Haakon VII.
She was the youngest daughter of the British king Edward VII and Alexandra of Denmark.
Maud of Wales was the first queen of Norway in over five centuries who was not also queen of Denmark or Sweden.
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.
Philip II of France
Philip II (21 August 1165 – 14 July 1223), known as Philip Augustus , was King of France from 1180 to 1223.
His predecessors had been known as kings of the Franks, but from 1190 onward, Philip became the first French monarch to style himself "King of France".
The son of King Louis VII and his third wife, Adela of Champagne, he was originally nicknamed "Dieudonné" (God-given) because he was a first son and born late in his father's life.
Philip was given the epithet "Augustus" by the chronicler Rigord for having extended the crown lands of France so remarkably.
The only known description of Philip describes him as
After a twelve-year struggle with the Plantagenet dynasty in the Anglo-French War of 1202–14, Philip succeeded in breaking up the large Angevin Empire presided over by the crown of England and defeated a coalition of his rivals (German, Flemish and English) at the Battle of Bouvines in 1214.
This victory would have a lasting impact on western European politics: the authority of the French king became unchallenged, while the English King John was forced by his barons to sign Magna Carta and deal with a rebellion against him aided by Philip, the First Barons' War.
The military actions surrounding the Albigensian Crusade helped prepare the expansion of France southward.
Philip did not participate directly in these actions, but he allowed his vassals and knights to help carry them out.
Philip transformed France from a small feudal state into the most prosperous and powerful country in Europe.
He checked the power of the nobles and helped the towns to free themselves from seigneurial authority, granting privileges and liberties to the emergent bourgeoisie.
He built a great wall around Paris ("the Wall of Philip II Augustus"), re-organized the French government and brought financial stability to his country.
Ingeborg of Denmark, Duchess of Mecklenburg
Ingeborg of Denmark  (4 January 1347 – 16 June 1370) was the eldest daughter of Valdemar IV of Denmark and his wife Helvig of Schleswig.
By marriage she was Duchess of Mecklenburg, although she died before her husband succeeded her father-in-law.
She was potential heiress to the Danish throne and was the older sister of Margaret I of Denmark.
Ingeborg was betrothed to Duke Henry of Mecklenburg after the death of Ingeborg's older sister Margaret in 1350, who was betrothed to the Duke.
She had two sisters named Margaret.
The marriage contract between Henry and Ingeborg was established in Dornburg October 23, 1350.
Ingeborg and Henry then married in 1362.
They had the following children:
Ingeborg was potential heir to the Danish throne in 1363 upon the death of her only surviving brother Christopher, Duke of Lolland.
However, Denmark was an elective monarchy, and Ingeborg too predeceased King Valdemar.
Ingeborg's father died without appointing an heir.
The succession of to the Danish throne was disputed.
The Estates of Denmark met at Odense to elect the next king.
The nobles were divided between either electing Ingeborg's son Albert IV, put forth by his grandfather Albert II, Duke of Mecklenburg; Margaret's son Olaf II, heir to the Norwegian throne; or choosing a new dynasty.
The estates were eventually won over by Queen Margaret's charm and popularity, as the only surviving daughter of the deceased king, and along with the potential of a union with Norway and anti-German sentiments, Olaf II was elected as King of Denmark in 1376 with Queen Margaret as regent.
With Albert III, Duke of Mecklenburg, Ingeborg's brother-in-law, on the Swedish throne, the Danish may not want another Mecklenburg ruler in Scandinavia.
Ingeborg's grandson Eric of Pomerania inherited the rights of his grandmother and succeeded as King of Denmark in 1396 with Margaret as his regent.
He became the first monarch of the Kalmar Union between Denmark, Norway, and Sweden.
Her last surviving descendants was Christopher of Bavaria who succeeded Eric as ruler of the Kalmar Union.
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.
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.
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.
Sophie of Mecklenburg-Güstrow
Sophie of Mecklenburg-Güstrow (4 September 1557 – 14 October 1631) was Queen of Denmark and Norway by marriage to Frederick II of Denmark.
She was the mother of King Christian IV of Denmark.
She was Regent of Schleswig-Holstein 1590–1594.

Question: What is the date of death of Ingeborg Of Denmark, Queen Of France's husband?
Answer: 14 July 1223