what is the {start time} for {Francisco Franco} has {spouse} as {Carmen Polo, 1st Lady of Meirás} ?
What year did Carmen Polo, 1st Lady of Meiras, and Francisco Franco marry?
When did Francisco Franco marry Carmen Polo, 1st Lady of Meiras?
SELECT ?q WHERE { ?v property:start_time ?q . resource:Francisco_Franco_Bahamonde property:spouse ?v . ?v property:spouse resource:María_del_Carmen_Polo_Martínez-Valdés }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q29179> .
?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/Q943785> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q29179 p:P26 ?s . ?s ps:P26 wd:Q943785 . ?s pq:P580 ?value}