Question: Who is the mother of Charlemagne, and when did she have Giesela?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q3044 p:P40 ?s . ?s ps:P40 wd:Q946829 . ?s pq:P25 ?value1 . ?s pq:P569 ?value2 }