what is the {sourcing circumstances} for {Roger Bacon} has {date of birth} as {1219-0-0} ?
To place For Roger Bacon's birth in 1219, which sources can be cited?
Which sources can be cited to place Roger Bacon's birth in 1219?
SELECT ?z WHERE { ?g property:date_of_birth ?i . ?g property:sourcing_circumstances ?z . resource:Roger_Bacon property:date_of_birth ?g . FILTER ( CONTAINS ( YEAR ( ?i ) , '1219' ) ) }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q171677> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P569> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <1219-0-0> .
?statement <http://www.wikidata.org/entity/P1480> ?value. 
} 

SELECT ?value WHERE { wd:Q171677 p:P569 ?s . ?s ps:P569 ?x filter(contains(YEAR(?x),'1219')) . ?s pq:P1480 ?value}