About Anne-Catherine de Ligniville, Madame Helvétius
Anne-Catherine de Ligniville, Madame Helvétius (23 July 1722 – 12 August 1800), also Anne-Catherine de Ligniville d'Autricourt, nicknamed "Minette", maintained a renowned salon in France in the eighteenth century.
Source: John Pierpont Morgan, Thomas Humphry Ward, William Roberts, Pictures in the Collection of J. Pierpont Morgan at Princes Gate & Dover House. Volume 2. (London, Privately printed, 1907). License: CC-PD-Mark PD-Art (PD-old-100)