What is {owned by} of {Mona Lisa} that is {start time} is {1519-0-0} ?
In 1519 who was the owner of the Mona Lisa?
Who owned the Mona Lisa in 1519?
SELECT ?j WHERE { resource:Mona_Lisa property:owned_by ?w . ?w property:start_time ?k . FILTER ( CONTAINS ( YEAR ( ?k ) , '1519' ) ) . ?w property:owned_by ?j }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q12418> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P127> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1519-0-0>
} 

SELECT ?obj WHERE { wd:Q12418 p:P127 ?s . ?s ps:P127 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1519')) }