What is the {human} for {spouse} of {Rollo}
Who was Rollo's wife?
Who was the wife of Rollo ?
SELECT DISTINCT ?v WHERE { ?v property:spouse resource:Rollo . ?v rdf:type ontology:human }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q273773> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?sbj where { ?sbj wdt:P26 wd:Q273773 . ?sbj wdt:P31 wd:Q5 } 
Poppa of Bayeux Gisela of France