French School, (9th century); French. Medium: pen and ink on paper. Date: 842. Serments pretes a Strasbourg entre Charles le Chauve et Louis le Germanique; later Holy Roman Emperor Charles II; Louis king of the East Frank (817-77); alliance against their brother, Emperor Lothair; oldest known specimen of French and old German; result of this alliance was the Treaty of Verdun; (843) partition of Charlemagne's empire; Provenance: Bibliotheque Nationale, Paris, France / Giraudon. Photographic Rights The Bridgeman Art Library.