Question: Where are Aureus and Solidus used as currency?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/ontology/currency> <http://dbpedia.org/resource/Aureus> . ?uri <http://dbpedia.org/ontology/currency> <http://dbpedia.org/resource/Solidus_(coin)> . }
Answer: The countries whose currencies are Aureus and Solidus are [Roman Empire, History of the Roman Empire].