Question: What position did William Cavendish-Bentinck, 3rd Duke of Portland hold on March, 31 1807?
Paraphrase: On March 31, 1807 what positin did the 3rd Duke of Portland hold, Duke William Cavendish-Bentinck?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q157208 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1807')) }