what is the {start time} for {John of England} has {spouse} as {Isabel, Countess of Gloucester} ?
John of England had a wife, Countess Isabel of Glouchester, during what time period?
When was Countess Isabel of Gloucester the wife of John of England?
SELECT ?y WHERE { ?x property:spouse resource:Isabel,_Countess_of_Gloucester . ?x property:start_time ?y . resource:John,_King_of_England property:spouse ?x }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q129308> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q242636> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q129308 p:P26 ?s . ?s ps:P26 wd:Q242636 . ?s pq:P580 ?value}