query: SELECT ?person ?personLabel ?date_of_death  
  WHERE {
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
    ?person wdt:P31 wd:Q5.
    ?person wdt:P570 ?date_of_death.
    FILTER(?date_of_death <= "1901-01-01T00:00:00Z"^^xsd:dateTime)           
    # died before 1901
    ?person wdt:P27 wd:Q408 .     
    FILTER NOT EXISTS { ?person p:P27 ?statement . ?statement prov:wasDerivedFrom ?derivedFrom .
                        ?statement ps:P27 wd:Q408 . }
    # filter out any where the P27:Q408 statement is sourced (to anything at all)
  }
  