Hélène-Louise Demars

Demars was born in 1736 in France, probably in Paris. Her father, Jean-Odéo Demars was a musician at two churches in Paris. After her father died in 1756, she lived with her mother and siblings in the Rue St. Thomas du Louvre. • Illustration — Rue St. Thomas du Louvre, where Demars lived with her mother and siblings after her father died

In 1759, Demars married Jean-Baptiste Vernier, a violinist and music dealer specializing in foreign editions. It is unknown if she and her husband had any children.

Demars' most cited-work, "L'Horoscope" is dedicated to Mademoiselle de Soubise of the Rohan family. It was performed for de Soubise as early as 21 November 1748, when Demars was about 12 years old. It was published in the Mercure de France in 1749. Demars dedicated her work "Hercule et Omphale" to Madame La Marquise de Villeroy. She composed several other works. Demars became a member of a literary circle run by Alexandre Le Riche de La Poupelinière, an influential patron of the Enlightenment Era. De La Poupelinière circle's may have provided Demars with introductions to artists and potential patrons. • Illustration — La Tour - La Pouplinière WB 205 Demars also taught the violin and the harpsichord. She was advertised in the "Tableau de Paris pour l'annee 1759," as a "maîtresse" or "teacher" of the harpsichord.