what is the {end time} for {Vladimir the Great} has {position held} as {Grand Prince of Kiev} ?
Vladimir the Great was Grand Prince of Kiev during what time period?
What if the time frame that Vladimir the Great was Grand Prince of Kiev?
SELECT ?t WHERE { ?v property:position_held resource:Grand_Prince_of_Kiev . resource:Vladimir_the_Great property:position_held ?v . ?v property:end_time ?t }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q14974> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1097003> .
?statement <http://www.wikidata.org/entity/P582> ?value. 
} 

SELECT ?value WHERE { wd:Q14974 p:P39 ?s . ?s ps:P39 wd:Q1097003 . ?s pq:P582 ?value}