Question: Who were the opponents of the people buried in the tower of London?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/restingPlace> <http://dbpedia.org/resource/Tower_of_London> . ?x <http://dbpedia.org/ontology/opponent> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}