What is {position held} of {Sargon II} that is {start time} is {-721-0-0} ?
Established in 721, Sargon 2 has which position?
What position did Sargon 2, who started in 721, hold?
SELECT ?c WHERE { ?g property:position_held ?c . FILTER ( CONTAINS ( ?z , '-721-0-0' ) ) . ?g property:start_time ?z . resource:Sargon_II property:position_held ?g }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q208336> .
?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> ?obj .
?statement <http://www.wikidata.org/entity/P580> <-721-0-0>
} 

SELECT ?obj WHERE { wd:Q208336 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P580 ?x filter(contains(?x , '-721-0-0')) }