Question: Who was Leonardo Da Vinci's teacher who worked as a diplomat?
Answer(s):
answer: John Argyropoulos

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.04lg6)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.04lg6 ns:influence.influence_node.influenced_by ?x .
?x ns:people.person.profession ns:m.080ntlp . 
}