what is the {start time} for {Arthur Wellesley, 1st Duke of Wellington} has {position held} as {Prime Minister of the United Kingdom} ?
When was Arthur Wellesley, 1st Duke of Wellington, the Prime Minister of the UK?
What is the { start time } for { Arthur Wellesley, 1st Duke of Wellington } as { Prime Minister of the United Kingdom }?
SELECT ?d WHERE { resource:Arthur_Wellesley,_1st_Duke_of_Wellington property:position_held ?c . ?c property:start_time ?d . ?c property:position_held resource:Prime_Minister_of_the_United_Kingdom }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q131691> .
?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/Q14211> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q131691 p:P39 ?s . ?s ps:P39 wd:Q14211 . ?s pq:P580 ?value}