what is the {start time} for {Palestine} has {instance of} as {historical region} ?
On what date was Palestine declared to be a historical region?
When was Palestine the instance of historical region ?
SELECT ?c WHERE { resource:Palestine rdf:type ?v . ?v property:start_time ?c . ?v rdf:type ontology:historical_region }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q23792> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1620908> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q23792 p:P31 ?s . ?s ps:P31 wd:Q1620908 . ?s pq:P580 ?value}