Question: What is the place of death of the royalties one of whose parents was Adam Ludwik Czartoryski?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/parent> <http://dbpedia.org/resource/Adam_Ludwik_Czartoryski> . ?x <http://dbpedia.org/property/deathPlace> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Royalty>}