Frederik, Crown Prince of Denmark
Frederik, Crown Prince of Denmark, Count of Monpezat, (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 the late Henrik, Prince Consort.
Mary, Crown Princess of Denmark
Mary, Crown Princess of Denmark, Countess of Monpezat,( Mary Elizabeth;" née" Donaldson; born 5 February 1972) is the wife of Frederik, Crown Prince of Denmark.
Frederik is the heir apparent to the throne, which means that should Frederik succeed, she will automatically become Queen of Denmark.
The couple met at the Slip Inn, a pub in Sydney when the prince was visiting Australia during the 2000 Summer Olympics.
Their official engagement in 2003 and their marriage the following year was the subject of extensive attention from Australian and European news media, which portrayed the marriage as a modern" fairytale" romance between a prince and a commoner.
Sima Yu
Sima Yu (司馬遹) (278–300), courtesy name Xizu (熙祖),
formally Crown Prince Minhuai (愍懷太子) was a Chinese crown prince during the Jin Dynasty (265-420).
Sima Yu's father Sima Zhong was developmentally disabled, and before he, then crown prince, was to marry his wife Jia Nanfeng, his father Emperor Wu gave him one of his own concubines, Consort Xie Jiu (謝玖), so that Consort Xie could teach him how to have sexual relations.
While Crown Princess Jia bore the crown prince four daughters, Sima Yu was his only son.
When Sima Yu was four years old, there was a fire in the palace, and Emperor Wu walked up a tower to observe it.
Sima Yu pulled him aside and said, "At night, when something unusual like this happens, we should take precautions.
The light of the fire should not shine on the emperor."
Emperor Wu was surprised by this perceptive observation by a child, and praised the young prince as very much like his own grandfather Sima Yi.
This was part of the reason why Emperor Wu let Crown Prince Zhong remain his heir.
In 289, he created Prince Yu the Prince of Guangling.
After Emperor Wu died in 290, Crown Prince Zhong ascended the throne as Emperor Hui, and Prince Yu was created crown prince.
As Crown Prince Yu grew in age, however, he lost some of the good reputation that he had as a child, as he disliked studying and spent much time on building projects and games.
Empress Jia, who had constantly been jealous of Crown Prince Yu and Consort Xie, did not discourage this behavior, but in fact encouraged it to further damage Crown Prince Yu's reputation.
When Crown Prince Yu's staff would try to correct his ways, he would not listen to them.
He also would not listen to them with regard to their advice to maintain strong relations with Empress Jia's family members.
Empress Jia's mother Guo Huai (郭槐) had constantly advised Empress Jia to treat Crown Prince Yu
well, as her own son, and she advocated marrying a daughter of Empress Jia's sister Jia Wu (賈午) to Crown Prince Yu.
However, Empress Jia and Jia Wu opposed this, and instead married a daughter of the official Wang Yan (王衍) to Crown Prince Yu.
(Wang had two daughters, but Empress Jia had Crown Prince Yu marry the less beautiful one and had her nephew Jia Mi marry the more beautiful one.)
After Lady Guo's death, the relationship between Empress Jia and Crown Prince Yu quickly deteriorated, as Jia Wu and another associate of Empress Jia, Emperor Wu's concubine Consort Zhao Can (趙粲), provoked difficulties between them.
Further, Crown Prince Yu and Jia Mi never liked each other, and Jia Mi, as a result, also advised Empress Jia to depose Crown Prince Yu.
In 299, Empress Jia agreed and took action.
When Crown Prince Yu was in the palace to make an official petition to have his ill son Sima Bin (司馬彬) created a prince, Empress Jia forced him to drink a large amount of wine and, once he was drunk, had him write out a statement in which he declared intention to murder the emperor and the empress and to take over as emperor.
Empress Jia presented the writing to the officials and initially wanted Crown Prince Yu executed—but after some resistance, she only had him deposed and reduced to status of a commoner.
Crown Prince Yu's mother Consort Xie was executed, as was his favorite concubine Consort Jiang Jun (蔣俊, Sima Bin's mother).
Wang Yan divorced his daughter from the crown prince, who wrote an extant, lengthy letter to her explaining the incident through which Empress Jia framed him.
In 300, under the advice of a prince she favored -- Sima Lun the Prince of Zhao, Emperor Wu's granduncle—Empress Jia decided to eliminate Crown Prince Yu as a threat.
She sent assassins and had Crown Prince Yu assassinated.
He was buried with honors due a prince—under the title of Prince of Guanling.
Sima Lun's intent was, however, to use this assassination as excuse to overthrow Empress Jia, and he did so later that year.
He had Crown Prince Yu reburied with the honors due a crown prince and had him given the posthumous name Minhuai.
He also welcomed Crown Princess Wang back to the palace, along with Crown Prince Yu's surviving sons Sima Zang (司馬臧) (whom he had created crown prince) and Sima Shang (司馬尚).
However, when Sima Lun then usurped the throne briefly in 301, Crown Prince Zang was killed.
After Emperor Hui's restoration later that year, Sima Shang was created crown prince, but died in 302, extinguishing Crown Prince Yu's line.
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.
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.
Francis of Denmark
Francis of Denmark( 15 July 1497 – 1 April 1511), was a prince of Denmark, Norway and Sweden, the youngest son of King John of Denmark and Christina of Saxony.
Pavlos, Crown Prince of Greece
Pavlos, Crown Prince of Greece, RE( 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.
As a male- line descendant of Christian IX of Denmark, he is also a Danish prince.
Margrethe II of Denmark
Margrethe II (full name: "Margrethe Alexandrine Þórhildur Ingrid"; born 16 April 1940) is Queen of Denmark, as well as 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 became heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne.
Margrethe succeeded her father upon his death on 14 January 1972.
On her accession, she became the first female monarch of Denmark since Margrethe 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 and Prince Joachim.
She has been on the Danish throne for years, becoming the second-longest-reigning Danish monarch after her ancestor Christian IV.
John Dalgleish Donaldson
John Dalgleish Donaldson( born 5 September 1941) is a Scottish- Australian professor and the father of Mary, Crown Princess of Denmark, the wife of the heir apparent to the throne of Denmark, Frederik, Crown Prince of Denmark.
Wilhelm, German Crown Prince
Wilhelm, German Crown Prince (6 May 1882 – 20 July 1951) was the eldest child and heir of the last German Emperor, Wilhelm II, and the last Crown Prince of the German Empire and the Kingdom of Prussia.
After the death of his grandfather Emperor Frederick III, Wilhelm became crown prince at the age of six, retaining that title for more than 30 years until the fall of the empire on 9 November 1918.
During World War I, he commanded the 5th Army from 1914 to 1916 and was commander of the Army Group German Crown Prince for the remainder of the war.
Crown Prince Wilhelm became head of the House of Hohenzollern on 4 June 1941 following the death of his father and held the position until his own death on 20 July 1951.

Question: Who is the maternal grandfather of Frederik, Crown Prince Of Denmark?
Answer: Frederick IX of Denmark