Question: Which person's date of death is after Jan 23,1820, that raised Queen Victoria?
Answer(s):
answer: Princess Victoria of Saxe-Coburg-Saalfeld

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0cw10)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0cw10 ns:people.person.parents ?x .
?x ns:people.deceased_person.date_of_death ?num .
FILTER (?num > "1820-01-23"^^xsd:dateTime) . 
}