Marquis de Moustier
Marquis de Moustier is mentioned in the provenance of the painting Adoration by Rogier van der Weyden (Schloss German no. 273/ French no. 286).
Further research indicates that this provenance reference is maybe related to Léonel-Rémi-François, marquis de Moustier (1817-1869). who was a French diplomat and politician.