When was Charlemagne's son Hugh born, and who was his mother?
SELECT ?value1 ?value2 WHERE { wd:Q3044 p:P40 ?s . ?s ps:P40 wd:Q920516 . ?s pq:P25 ?value1 . ?s pq:P569 ?value2 }
charlemagne: Q3044 hugh: Q920516