what is the {start time} for {Anna Akhmatova} has {spouse} as {Nikolay Gumilev} ?
What was the wedding date of Nikolay Gumilev and Anna Akhmatova?
When did Anna Akhmatova marry Nikolay Gumilev?
SELECT ?e WHERE { resource:Anna_Akhmatova property:spouse ?r . ?r property:start_time ?e . ?r property:spouse resource:Nikolay_Gumilev }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q80440> .
?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/Q311033> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q80440 p:P26 ?s . ?s ps:P26 wd:Q311033 . ?s pq:P580 ?value}