Question: The Fate of the House of Habsburg, is a 1928 German silent drama film, it s based on the Mayerling incident, the series of events leading to the apparent murder–suicide of Rudolf, Crown Prince of Austria, and his lover, Baroness Mary Vetsera, in which year?

full_context: Document 1: Mayerling incident: The Mayerling Incident is the series of events leading to the apparent murder–suicide of Rudolf, Crown Prince of Austria (21 August 1858 – 30 January 1889) and his lover, Baroness Mary Vetsera (19 March 1871 – 30 January 1889). Rudolf was the only son of Emperor Franz Joseph I of Austria and Empress Elisabeth, and heir to the throne of the Austro-Hungarian Empire. Rudolf's mistress was the daughter of Baron Albin Vetsera, a diplomat at the Austrian court. The bodies of the 30-year-old Archduke and the 17-year-old baroness were discovered in the Imperial hunting lodge at Mayerling in the Vienna Woods, fifteen miles southwest of the capital, on the morning of 30 January 1889.
Document 2: Princess Sophie of Hohenberg: Princess Sophie of Hohenberg ("Sophie Marie Franziska Antonia Ignatia Alberta von Hohenberg"; (1901--)24 1901 – (1990--)27 1990 ) was the only daughter of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg, both of whom were assassinated at Sarejevo on 28 June 1914. Their assassination triggered the First World War, thus Sophie and her two brothers are sometimes described as the first orphans of the First World War.
Document 3: Franz, Duke of Hohenberg: Franz Ferdinand, Duke of Hohenberg (born 13 September 1927 at Artstetten Castle, Austria – died 16 August 1977 at Ried in der Riedmark, Austria), was the eldest son of Maximilian, Duke of Hohenberg and Countess Maria of Waldburg zu Wolfegg und Waldsee. He was also a grandson of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg. As a result of that morganatic marriage, the Hohenbergs were excluded from the line of succession to the Austro-Hungarian throne.
Document 4: Tragedy in the House of Habsburg: Tragedy in the House of Habsburg (German: Tragödie im Hause Habsburg) is a 1924 German silent historical film directed by Alexander Korda and starring María Corda, Kálmán Zátony and Emil Fenyvessy. The film recounts the events of the 1889 Mayerling Incident in which the heir to the Austro-Hungarian Empire committed suicide. Studio filming was done in Berlin with location shooting in Vienna. The film cost $80,000 to make, but only earned back around half of this at the box office.
Document 5: Archduchess Elisabeth Marie of Austria: Archduchess Elisabeth Marie of Austria (Elisabeth Maria 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.
Document 6: Rudolf (musical): Rudolf is a musical conceived for the stage by Frank Wildhorn and Steve Cuden, with a book by Jack Murphy and Phoebe Hwang, lyrics by Murphy, additional lyrics by Nan Knighton, and music by Frank Wildhorn. Arrangements by Koen Schoots and orchestrations by Kim Scharnberg. It is about Rudolf, Crown Prince of Austria and his extramarital relationship with Baroness Mary Vetsera. Their 1889 deaths at his Mayerling hunting lodge apparently were the result of a murder-suicide pact, although historians have debated this explanation.
Document 7: Crown Prince Rudolph's Last Love: Crown Prince Rudolph's Last Love (German: Kronprinz Rudolfs letzte Liebe/Mayerling) is a 1955 Austrian historical drama film directed by Rudolf Jugert and starring Rudolf Prack, Christiane Hörbiger and Winnie Markus. The film portrays the tragic 1889 Mayerling Incident, in which Rudolf, Crown Prince of Austria and his lover Baroness Mary Vetsera committed suicide.
Document 8: Baroness Mary Vetsera: Baroness Marie Alexandrine von Vetsera (19 March 1871 – 30 January 1889) was a member of Austrian "second society" (new nobility) and one of Crown Prince Rudolf of Austria's mistresses. Vetsera and Rudolf were found dead, an apparent murder suicide, at his hunting lodge, Mayerling (see Mayerling Incident).
Document 9: Princess Stephanie of Windisch-Graetz: Princess Stéphanie of Windisch-Graetz (April 4, 1909 in Ploskovice, Bohemia – May 29, 2005 in Uccle, Belgium) was the daughter of Prince Otto Weriand of Windisch-Graetz (1873–1952) and Archduchess Elisabeth Marie of Austria (1883–1963), only child of Crown Prince Rudolf of Austria and Princess Stéphanie of Belgium. She was the great-grandchild of Emperor Franz-Joseph and Empress Elisabeth ('Sissi') of Austria. She was also the great-grandchild of King Leopold II of Belgium.
Document 10: 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.
Document 11: The Fate of the House of Habsburg: The Fate of the House of Habsburg (German: Das Schicksal derer von Habsburg) is a 1928 German silent drama film directed by Rolf Raffé and starring Fritz Spira, Alphons Fryland and Leni Riefenstahl. It is based on the Mayerling incident of 1889.
Document 12: Princess Stéphanie of Belgium: Princess Stéphanie of Belgium (21 May 1864 – 23 August 1945) was a Belgian princess by birth and became Crown Princess of Austria through her marriage to the heir-apparent of the Habsburg dynasty, Archduke Rudolf. She was famously widowed in 1889 when Rudolf and his mistress, Mary Vetsera, were found dead in an apparent murder-suicide pact at the Imperial hunting lodge at Mayerling in the Vienna Woods.
Document 13: Rudolf, Crown Prince of Austria: Rudolf, Crown Prince of Austria (Rudolf Franz Karl Joseph; 21 August 1858 – 30 January 1889) was the only son of Emperor Franz Joseph I and 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.
Document 14: Archduke Franz Ferdinand of Austria: Franz Ferdinand Carl Ludwig Joseph Maria (18 December 1863 – 28 June 1914) was an Archduke of Austria-Este, Austro-Hungarian and Royal Prince of Hungary and of Bohemia and, from 1896 until his death, heir presumptive to the Austro-Hungarian throne.
Document 15: House of Habsburg: The House of Habsburg ( ; ] ), also called House of Austria, was one of the most influential and outstanding royal houses of Europe. The throne of the Holy Roman Empire was continuously occupied by the Habsburgs between 1438 and 1740. The house also produced emperors and kings of the Kingdom of Bohemia, Kingdom of England ("Jure uxoris" King), Kingdom of Germany, Kingdom of Hungary, Kingdom of Croatia, Second Mexican Empire, Kingdom of Ireland ("Jure uxoris" King), Kingdom of Portugal, and Spain, as well as rulers of several Dutch and Italian principalities. From the 16th century, following the reign of Charles V, the dynasty was split between its Austrian and Spanish branches. Although they ruled distinct territories, they nevertheless maintained close relations and frequently intermarried.
ground_truth: 1889