Question: When was the last time the champion of the 2013 AFC Championship Game win the Superbowl?
Answer(s):
answer: Super Bowl XLVII

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:sports.sports_team.championships ns:m.0_gtz8t . 
?c ns:sports.sports_team.championships ?x .
?x ns:sports.sports_championship_event.championship ns:m.06x5s .
?x ns:time.event.end_date ?sk0 .
}
ORDER BY DESC(xsd:datetime(?sk0))
LIMIT 1