Question: What site of the Battle of Appomattox was established earliest?
Answer(s):
answer: Appomattox Court House

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.054pn2)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.054pn2 ns:time.event.locations ?x .
?x ns:protected_sites.protected_site.date_established ?num .
}
ORDER BY ?num LIMIT 1