Question: Among the countries using Aureus as currency which had Nicomedia as an important place?
SPARQL query: SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/capital> <http://dbpedia.org/resource/Nicomedia> . ?uri <http://dbpedia.org/ontology/currency> <http://dbpedia.org/resource/Aureus>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Country>}
Answer: The country with capital Nicomedia and currency Aureus is [Roman Empire].