Question: Name the commanders of military conflicts where Roundhead was one of the commander ?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/commander> <http://dbpedia.org/resource/Roundhead_(Wyandot)> . ?x <http://dbpedia.org/ontology/commander> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MilitaryConflict>}