Question: Name the kingdom with currency Solidus (coin) and administrative headquarters in Nicomedia?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri onto:currency <http://dbpedia.org/resource/Solidus_(coin)> . ?uri onto:capital <http://dbpedia.org/resource/Nicomedia>  . }