Question: When did team owner James D. Stern's sports team first win their Championship?
Answer(s):
answer: 1991 NBA Finals

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.professional_sports_team.owner_s ns:m.0ggb8tz . 
?c ns:sports.sports_team.championships ?x .
?x ns:time.event.start_date ?sk0 .
}
ORDER BY xsd:datetime(?sk0)
LIMIT 1