Question: Which artist who died before August 1863 was an influence on Vincent van Gogh's work?
Answer(s):
answer: Peter Paul Rubens
answer: Rembrandt

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.07_m2)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.07_m2 ns:influence.influence_node.influenced_by ?x .
?x ns:people.deceased_person.date_of_death ?num .
FILTER (?num < "1863-08-13"^^xsd:dateTime) . 
}