What is {start time} of {classical antiquity} that is {nature of statement} is {disputed} ?
When did it become a nature of statement for classical antiquity?
When did classical antiquity become a nature of ststement?
SELECT ?j WHERE { ?o property:nature_of_statement resource:disputed . resource:classical_antiquity property:start_time ?o . ?o property:start_time ?j }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q486761> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P580> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P5102> <http://wikidata.dbpedia.org/resource/Q18912752>
} 

SELECT ?obj WHERE { wd:Q486761 p:P580 ?s . ?s ps:P580 ?obj . ?s pq:P5102 wd:Q18912752 }