what is the {start time} for {Raúl Castro} has {spouse} as {Vilma Espín} ?
When did Raul Castro marry Vilma Espin?
When did Raúl Castro marry Vilma Espín?
SELECT ?p WHERE { resource:Raúl_Castro_Ruz property:spouse ?h . ?h property:spouse resource:Vilma_Espín . ?h property:start_time ?p }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q46809> .
?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/Q466662> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q46809 p:P26 ?s . ?s ps:P26 wd:Q466662 . ?s pq:P580 ?value}