What is the {historical period} for {official language} of {Latin}
Which period in time did individuals talk Latin?
Which period in time did people speak Latin?
SELECT DISTINCT ?r WHERE { ?r property:official_language resource:Latin . ?r rdf:type ontology:historical_period }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P37> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q397> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q11514315> } 
 select distinct ?sbj where { ?sbj wdt:P37 wd:Q397 . ?sbj wdt:P31 wd:Q11514315 } 
Roman Kingdom Roman Empire Byzantine Empire