What is the {periodization} for {followed by} of {Parthian Empire}
In which historial period the Parthian Empire did exist ?
 select distinct ?obj where { wd:Q1986139 wdt:P156 ?obj . ?obj wdt:P31 wd:Q816829 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1986139> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P156> . ?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/Q816829> } 
In which historial period the Parthian Realm did exist ?