Question: When was the king who was the subject of Siegfried Obermeier's "The Secret Diaries of Ludwig II of Bavaria" born? 

full_context: Document 1: Ludwig: Requiem for a Virgin King: Ludwig: Requiem for a Virgin King (German: Ludwig – Requiem für einen jungfräulichen König ) is a 1972 West German historical drama film directed by Hans-Jürgen Syberberg, starring Harry Baer as Ludwig II of Bavaria. The film was shot on a soundstage with rear-projected scenography and an intentionally artificial style.
Document 2: Luitpold, Prince Regent of Bavaria: Luitpold, Prince Regent of Bavaria (German: "Prinzregent Luitpold Karl Joseph Wilhelm Ludwig von Bayern" ) (12 March 1821 – 12 December 1912), was the "de facto" ruler of Bavaria from 1886 to 1912, due to the incapacity of his nephews, King Ludwig II for three days and King Otto for 26 years.
Document 3: Neuschwanstein Castle: Neuschwanstein Castle (German: Schloss Neuschwanstein , ] , English: "New Swanstone Castle" ) is a nineteenth-century Romanesque Revival palace on a rugged hill above the village of Hohenschwangau near Füssen in southwest Bavaria, Germany. The palace was commissioned by Ludwig II of Bavaria as a retreat and as a homage to Richard Wagner. Ludwig paid for the palace out of his personal fortune and by means of extensive borrowing, rather than Bavarian public funds.
Document 4: Louis II, Duke of Bavaria: Ludwig I or Louis I of Upper Bavaria (German: "Ludwig II der Strenge, Herzog von Bayern, Pfalzgraf bei Rhein" ) (13 April 1229 – 2 February 1294) was Duke of Upper Bavaria and Count Palatine of the Rhine from 1253. He is known as Ludwig II or Louis II as Duke of Bavaria, and also as Louis the Strict. Born in Heidelberg, he was a son of duke Otto II and Agnes of the Palatinate. She was a daughter of the Welf Henry V, Count Palatine of the Rhine, her grandfathers were Henry XII the Lion and Conrad of Hohenstaufen.
Document 5: The World of Yesterday: The World of Yesterday: Memories of a European (German title Die Welt von Gestern: Erinnerungen eines Europäers) is the memoir of Austrian writer Stefan Zweig. It is considered the most famous book on the Habsburg Empire. He started writing it in 1934 when, anticipating Anschluss and Nazi persecution, he uprooted himself from Austria to England and later to Brazil. He posted the manuscript, typed by his second wife Lotte Altmann, to the publisher the day before they both committed suicide in February 1942. The book was first published in Stockholm (1942), as "Die Welt von Gestern". It was first published in English in April 1943 by Viking Press. In 2011, Plunkett Lake Press reissued it in eBook form.
Document 6: Ludwig II, King of Bavaria: Ludwig II, King of Bavaria (German: Ludwig der Zweite, König von Bayern) is a 1929 German silent historical film directed by William Dieterle and starring Dieterle, Theodor Loos and Eugen Burg. It portrays the life and reign of the monarch Ludwig II who ruled Bavaria from 1864 to 1886. It was made at the Bavaria Studios in Geiselgasteig, Munich. The production company was the German subsidiary of the American studio Universal Pictures.
Document 7: Ludwig II of Bavaria: Ludwig II (German: "Ludwig Otto Friedrich Wilhelm" ; English: Louis Otto Frederick William ; 25 August 1845 – 13 June 1886) was King of Bavaria from 1864 until his death in 1886. He is sometimes called the Swan King, Mad King Ludwig or der Märchenkönig (the 'Fairy Tale King'). He also held the titles of Count Palatine of the Rhine, Duke of Bavaria, Duke of Franconia, and Duke in Swabia.
Document 8: Berg Castle (Bavaria): Berg Castle (German: "Schloss Berg" ) is a manor house situated on the east shore of Lake Starnberg in the village of Berg in Upper Bavaria, Germany. It is famous as the site of King Ludwig II of Bavaria's death. Today, it remains home to the head of the house of Wittelsbach, currently Franz, Duke of Bavaria.
Document 9: Weisskunig: Der Weisskunig or The White King is a chivalric novel and thinly disguised biography of the Holy Roman Emperor, Maximilian I, (1486–1519) written in German by Maximilian and his secretary between 1505 and 1516. Although not explicitly identified as such in the book, Maximilian appears as the "young" White King, with his father Frederick III represented as the "old" White King.
Document 10: Stefan Zweig: Stefan Zweig ( ; ] ; November 28, 1881 – February 22, 1942) was an Austrian novelist, playwright, journalist and biographer. At the height of his literary career, in the 1920s and 1930s, he was one of the most popular writers in the world.
Document 11: Hohenschwangau Castle: Hohenschwangau Castle or Schloss Hohenschwangau (lit: "Upper Swan County Palace") is a 19th-century palace in southern Germany. It was the childhood residence of King Ludwig II of Bavaria and was built by his father, King Maximilian II of Bavaria. It is located in the German village of Hohenschwangau near the town of Füssen, part of the county of Ostallgäu in southwestern Bavaria, Germany, very close to the border with Austria.
Document 12: Josephine Mutzenbacher: Josephine Mutzenbacher – The Life Story of a Viennese Whore, as Told by Herself (German: "Josefine Mutzenbacher oder Die Geschichte einer Wienerischen Dirne von ihr selbst erzählt" ) is an erotic novel first published anonymously in Vienna, Austria in 1906. The novel is famous in the German-speaking world, having been in print in both German and English for over 100 years and sold over 3 million copies, becoming an erotic bestseller.
Document 13: Hermann Hesse: Hermann Karl Hesse (] ; 2 July 1877 – 9 August 1962) was a German-born poet, novelist, and painter. His best-known works include "Demian", "Steppenwolf", "Siddhartha", and "The Glass Bead Game", each of which explores an individual's search for authenticity, self-knowledge and spirituality. In 1946, he received the Nobel Prize in Literature.
Document 14: Siegfried Obermeier: Siegfried Obermeier (Munich, 21 January 1936 - Oberschleißheim near Munich, 21 January 2011) was a German author of historical novels and popular history books. He was editor of The Secret Diaries of Ludwig II of Bavaria 1976. In 1978 he issued his first novel, initially under the penname Carl de Scott, a novelisation of the second life of Judas Iscariot. His Jesus in India book "Starb Jesus in Kaschmir?" made it to the Year Bestseller List of the Spiegel in 1983.
Document 15: Otto Weininger: Otto Weininger (] ; 3 April 1880 – 4 October 1903) was an Austrian philosopher. In 1903, he published the book "Geschlecht und Charakter" ("Sex and Character"), which gained popularity after his suicide at the age of 23. Some people find Weininger's ideas to be misogynistic and antisemitic, while others find them to be extremely perceptive and realistic. Parts of his rhetoric were used by the Nazi regime (while at the same time denouncing him) - though this arguably cannot be held against him. Despite all criticisms Weininger was held to be a great genius by the philosopher Ludwig Wittgenstein and the writer August Strindberg (see discussion below).
ground_truth: 25 August 1845