Lothar Freiherr von Richthofen (born Lothar Siegfried Freiherr von Richthofen; 27 September 1894 – 4 July 1922) was a German First World War fighter ace credited with 40 victories.
 He was a younger brother of top-scoring ace Manfred von Richthofen (the "Red Baron") and a distant cousin of Luftwaffe Field Marshal Wolfram von Richthofen.
Karl Ernst Manfred Freiherr von Richthofen (24 May 1855 – 28 November 1939) was a German "General der Kavallerie" (General of the Cavalry) during World War I and recipient of the order Pour le Mérite, known informally as the Blue Max.
 Richthofen was a great uncle of his more famous namesake Manfred von Richthofen, known as the Red Baron, who was his godson and named after him.
Air Marshal Sir Robert Henry Magnus Spencer Saundby {'1': ", '2': ", '3': ", '4': "} (26 April 1896 – 25 September 1971) was an RAF officer whose career spanned both World War I and World War II.
 He distinguished himself gaining five victories during World War I, and was present during the air battle when Lanoe Hawker was shot down and killed by Manfred von Richthofen, the "Red Baron".
 He is chiefly remembered for his role as Deputy AOC in C Bomber Command under Sir Arthur 'Bomber' Harris during the latter part of World War II.
Ferdinand Freiherr von Richthofen (5 May 18336 October 1905), better known in English as Baron von Richthofen, was a German traveller, geographer, and scientist.
 He is noted for coining the terms "Seidenstraße" and "Seidenstraßen" = "Silk Road(s)" or "Silk Route(s)" in 1877.
 He also standardized the practices of chorography and chorology.
 He was an uncle of the World War I flying ace Manfred von Richthofen, best known as the "Red Baron".
Hermann Freiherr von Richthofen, GCVO (born 20 November 1933 in Breslau) is a German diplomat.
 He is a great nephew of Manfred von Richthofen, the "Red Baron".
Manfred von Richthofen (4 February 1934 – 1 May 2014) was a German hockey player and coach.
 He was also an honorary President of German's national Olympic federation.
 He was the nephew of World War I German pilot Manfred von Richthofen (the "Red Baron").
 His career began during the 1950s.
 He retired in 2006.
 Richthofen was born in Berlin, Germany.
The Red Baron (aka Der rote Baron (original title)) is a 2008 German-British biographical action war film written and directed by Nikolai Müllerschön about the World War I fighter pilot Manfred von Richthofen, known as the "Red Baron".
 The film stars Matthias Schweighöfer, Joseph Fiennes, Til Schweiger and Lena Headey.
 "The Red Baron" was filmed entirely in English to improve its international commercial viability.
Lanoe George Hawker VC, DSO (30 December 1890 – 23 November 1916) was a British First World War flying ace.
 Having seven credited victories, he was the third pilot to receive the Victoria Cross, the highest decoration for gallantry awarded to British and Commonwealth servicemen.
 He was killed in a dogfight with the famous German flying ace Manfred von Richthofen ("The Red Baron"), who described him as "the British Boelcke".
Frieda Lawrence (August 11, 1879 – August 11, 1956), born Frieda Freiin von Richthofen, was a German literary figure mainly known for her marriage to the British novelist D. H. Lawrence.
 She was a distant relation of Manfred von Richthofen, the "Red Baron".
Bolko von Richthofen (September 13, 1899 – March 18, 1983) was a German archaeologist and a distant relative of the family of Manfred von Richthofen, the "Red Baron".
 He is sometimes confused with his distant cousin and namesake, Karl Bolko von Richthofen (1903–1971) – the youngest brother of the fighter ace.

Question: When was the person who was shot down and killed by Manfred von Richthofen, the "Red Baron" during an air battle of which Robert Saundby was present, born?
Answer: 30 December 1890