Alma Vetsera Hayne
Alma Vetsera Hayne (1890–1919) was a New York City socialite who passed herself off as the daughter of Rudolf, Crown Prince of Austria and Baroness Mary Vetsera and called herself Princess Vetsera of Austria.
She claimed her son, Rudolph Hayne (1899-?), was heir to the Austro-Hungarian throne.
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.
Manuel, Prince of Portugal (1531–1537)
Manuel, Prince of Portugal( 11 November 1531 – 14 April 1537), was the Prince of Portugal from 1535 to his death in 1537.
He was the fifth child son of king John III of Portugal and Catherine of Austria.
In 1535, his father officially designated him as Prince of Portugal, taking the place of his eldest sister Infanta Maria Manuela.
However, after his premature death at five years old, his younger brother Infante Filipe became the next Prince of Portugal.
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.
Rudolf, Crown Prince of Austria
Rudolf, Crown Prince of Austria (21 August 1858 – 30 January 1889) was the only son and third child of Emperor Franz Joseph I and Elisabeth of Bavaria.
He was heir apparent to the throne of Austria-Hungary from birth.
In 1889, he died in a suicide pact with his mistress, Baroness Mary Vetsera, at the Mayerling hunting lodge.
The ensuing scandal made international headlines.
He was named after the first Habsburg King of Germany, Rudolf I, who assumed the throne in 1273.
Archduke Otto of Austria (1865–1906)
Archduke Otto Franz Joseph Karl Ludwig Maria of Austria (21 April 1865 – 1 November 1906) was the second son of Archduke Karl Ludwig of Austria (younger brother of Emperor Franz Joseph I of Austria) and his second wife, Princess Maria Annunciata of Bourbon-Two Sicilies.
He was the father of Charles I of Austria, the last Emperor of Austria.
Empress Elisabeth of Austria
Empress Elisabeth of Austria (born Duchess Elisabeth in Bavaria; 24 December 1837 – 10 September 1898) was Empress of Austria and Queen of Hungary by marriage to Emperor Franz Joseph I.
Elisabeth was born into the royal Bavarian House of Wittelsbach.
Nicknamed Sisi, she enjoyed an informal upbringing before marrying Emperor Franz Joseph
I at the age of sixteen.
The marriage thrust her into the much more formal Habsburg court life, for which she was unprepared and which she found uncongenial.
Early in the marriage she was at odds with her mother-in-law, Archduchess Sophie, who took over the rearing of Elisabeth's daughters, one of whom, Sophie, died in infancy.
The birth of the heir apparent, Crown Prince Rudolf, improved her standing at court, but her health suffered under the strain, and she would often visit Hungary for its more relaxed environment.
She came to develop a deep kinship with Hungary, and helped to bring about the dual monarchy of Austria–Hungary in 1867.
The death of her only son and his mistress Mary Vetsera, in a murder–suicide at his hunting lodge at Mayerling in 1889 was a blow from which Elisabeth never recovered.
She withdrew from court duties and travelled widely, unaccompanied by her family.
In 1890, she had a palace built on the Greek Island of Corfu that she visited often.
The palace Achilleion, featuring an elaborate mythological motif, served as a refuge.
She was obsessively concerned with maintaining her youthful figure and beauty, which were already legendary during her life.
While travelling in Geneva in 1898, she was mortally wounded by an Italian anarchist named Luigi Lucheni.
Elisabeth was the longest serving Empress of Austria at 44 years.
Archduchess Elisabeth Marie of Austria
Archduchess Elisabeth Marie of Austria (Elisabeth Marie Henriette Stephanie Gisela; 2 September 1883 – 16 March 1963) was the only child of Rudolf, Crown Prince of Austria and Princess Stéphanie of Belgium, and a granddaughter of Emperor Franz Joseph I of Austria and King Leopold II of the Belgians.
She was known to the family as "Erzsi", a diminutive of her name in Hungarian.
Later nicknamed "The Red Archduchess", she was famous for becoming a socialist and a member of the Austrian Social Democratic Party.
Stéphanie Windisch-Graetz
Princess Stéphanie Windisch- Graetz( 17 July 1939 – 12 July 2019) was the daughter of Prince Franz Joseph zu Windisch- Graetz and granddaughter of Archduchess Elisabeth Marie of Austria.
Archduchess Elisabeth was the daughter of Rudolf, Crown Prince of Austria and granddaughter of Emperor Franz Joseph I of Austria.
She became an artist, known for her photographic portraits using only candles as a source of light, and for her sensual images from the animal world.
She married Dermot Blundell- Hollinshead- Blundell( 1935 –2009).
They were the parents of Henry Victor William Blundell- Hollinshead- Blundell( born 1967) and Alexander Otto Blundell- Hollinshead- Blundell( born 1969) who adopted the surname of his mother in 2011.
She had one younger brother, Prince Guillaume Franz Josef Maria Windisch- Graetz( born 1950; unmarried).
She died in a hospital in Sint- Lambrechts- Woluwe on 12 July 2019 due to complications after a heart operation.
Mizzi Kaspar
Mizzi Kaspar or Mitzi Kaspar( 1864- 1907), was the royal mistress of Rudolf, Crown Prince of Austria.

Question: Where did Rudolf, Crown Prince Of Austria's mother die?
Answer: Geneva