Question: Name the kingdom with currency Solidus (coin) and administrative headquarters in Nicomedia?
SPARQL query: SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/currency> <http://dbpedia.org/resource/Solidus_(coin)> . ?uri <http://dbpedia.org/ontology/capital> <http://dbpedia.org/resource/Nicomedia>  . }
Answer: The kingdom whose currency is Solidus (coin) and one capital is Nicomedia is [Roman Empire].