What is the {ancient civilization} for {time period} of {Roman Empire}
When was the old Roman Domain in power?
When was the ancient Roman Empire in power?
SELECT DISTINCT ?t WHERE { ?t rdf:type ontology:ancient_civilization . resource:Roman_Empire property:time_period ?t }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2277> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2348> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q28171280> } 
 select distinct ?obj where { wd:Q2277 wdt:P2348 ?obj . ?obj wdt:P31 wd:Q28171280 } 