what is the {sourcing circumstances} for {Thales} has {date of death} as {-546-1-1} ?
What was the source of Thales' death on 1-1-546?
SELECT ?value WHERE { wd:Q36303 p:P570 ?s . ?s ps:P570 ?x filter(contains(?x,'-546-1-1')) . ?s pq:P1480 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q36303> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P570> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <-546-1-1> .
?statement <http://www.wikidata.org/entity/P1480> ?value. 
} 

How did Thales die on 1-1-546?