question: Who was born first, Willi Billmann or Henry Oliver Walker?
context: [["Willi Billmann", ["Willi Billmann( 15 January 1911 \u2013 5 July 2001) was a German international footballer."]], ["Wale Adebanwi", ["Wale Adebanwi( born 1969) is a Nigerian- born first Black Rhodes Professor at St Antony's College, Oxford."]], ["Oliver Walker", ["Oliver Walker( born 23 September 1985) is a British actor, known for his role on the TV series\" Atlantis\".", "He has also made guest appearances on\" DoctorsHolby City\" and\" Coronation Street\", among others."]], ["Hartley Lobban", ["Hartley W Lobban (9 May 1926 \u2013 15 October 2004) was a Jamaican-born first-class cricketer who played 17 matches for Worcestershire in the early 1950s."]], ["Henry W. Oliver", ["Henry W. Oliver( February 25, 1840 \u2013 February 8, 1904) was an American industrialist."]], ["Henry Oliver Walker", ["Henry Oliver Walker( May 14, 1843 \u2013 January 14, 1929) was an American painter of figures and portraits best known for his mural decorations.", "His works include a series of paintings honoring various poets for the Library of Congress and decorations for public buildings such as the Appellate Court House in New York City, Bowdoin College in Maine, the Massachusetts State House, the Minnesota State Capitol, and the Court House in Newark, New Jersey."]], ["Henry Brandeston", ["Henry Brandeston( or Henry of Braunstone) was a medieval Bishop of Salisbury."]], ["Henry Moore (cricketer)", ["Henry Walter Moore( 1849 \u2013 20 August 1916) was an English- born first- class cricketer who spent most of his life in New Zealand."]], ["Ollie Jones (songwriter)", ["Henry Oliver\" Ollie\" Jones( December 9, 1923 \u2013 October 4, 1990) was an American singer and songwriter."]], ["Henry Oliver (athlete)", ["Edward Henry Oliver( 9 July 1902 \u2013 9 April 1995) was a British middle- distance runner.", "He competed in the men's 3000 metres steeplechase at the 1928 Summer Olympics."]]]
supporting_facts: [["Willi Billmann", 0], ["Henry Oliver Walker", 0]]
evidences: [["Willi Billmann", "date of birth", "15 January 1911"], ["Henry Oliver Walker", "date of birth", "May 14, 1843"]]
answer: Henry Oliver Walker