what is the {sourcing circumstances} for {Muḥammad ibn Mūsā al-Khwārizmī} has {date of birth} as {780-1-1} ?
which was muhammad ibn musa al-khwarizmi born in the year 780?
When was Muḥammad ibn Mūsā al-Khwārizmī born in the year 780?
SELECT ?j WHERE { ?a property:date_of_birth ?y . resource:Al-Khwarizmi property:date_of_birth ?a . FILTER ( CONTAINS ( ?y , '780-1-1' ) ) . ?a property:sourcing_circumstances ?j }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q9038> .
?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> <780-1-1> .
?statement <http://www.wikidata.org/entity/P1480> ?value. 
} 

SELECT ?value WHERE { wd:Q9038 p:P569 ?s . ?s ps:P569 ?x filter(contains(?x , '780-1-1')) . ?s pq:P1480 ?value}