Did {Byzantine_Empire} {currency} {solidus}?
Did solidus belong as a currency to the Byzantine Empire?
Was solidus a currency of Byzantine Empire?
ASK WHERE { resource:Byzantine_Empire property:currency resource:solidus }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12544> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P38> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q231455>. } 
ASK WHERE { wd:Q12544 wdt:P38 wd:Q231455 }