Jean-Marie Leclair

French Baroque violinist and composer

Jean-Marie Leclair was discovered stabbed to death on 23 October 1764 in his home located within a perilous district of northern Paris near the old Temple. A foundational figure of the French violin school, this composer and performer spent his final years under the patronage of the Duke of Gramont, contributing music to private theatrical productions.

Early Career and Training

Born in Lyon in 1697, Leclair left his home city to pursue formal training in dance and violin performance in Turin. By 1723, he established himself in Paris, where he participated in the Concert Spirituel, an influential semi-public series of musical performances. His personal life during this period included his 1716 marriage to Marie-Rose Casthanie, a dancer who died around 1728.

THE FREE TEST
How high is yours?

Twenty questions, eight minutes on the clock, and a percentile measured against everyone who has taken it. No sign-up.

Take the IQ test →

Royal Service and European Engagements

In 1733, Louis XV appointed Leclair as the Director of Music of the Chapel and the Apartments. He dedicated his third collection of violin sonatas to the monarch but resigned his position in 1736 following a dispute with Jean-Pierre Guignon regarding the administration of the King's music. Following this, he entered the service of the Princess of Orange, dividing his time between her court in Leeuwarden and duties in The Hague as a private maestro di cappella.

Composition and Theatrical Output

Leclair integrated various European national styles into his compositions, which included numerous sonatas, concertos, and suites. His only opera, Scylla et Glaucus, premiered in 1746. While working for the Duke of Gramont at Puteaux starting in 1740, he composed stage works such as the 1749 divertissement for the comedy Les dangers des épreuves and the 1750 entrée Apollon et Climène. Many of his stage scores and ballets were subsequently lost.

Final Years and Unsolved Death

Following the dissolution of his second marriage—to the engraver Louise Roussel, who had printed his works from Opus 2 onward—Leclair resided alone in the Marais district. His violent death remains a subject of historical uncertainty. Investigators have debated whether his former spouse sought financial gain or if his disgruntled nephew, the violinist Guillaume-François Vial, committed the crime. He was interred at the Church of Saint-Laurent in Paris.

Fast facts

Questions readers ask

What instruments did Leclair play?

He was a professional violinist and also worked as a dancer and ballet master.

Who prepared Leclair's music for publication?

His second wife, Louise Roussel, an engraver who managed the printing of his scores from Opus 2 through his later works.

Achievements

Compare with the greats

Henri Poincar vs Johann Sebastian BachJohann Sebastian Bach vs Pablo PicassoFrancis Crick vs William James SidisCharles Dickens vs William James Sidis
See the IQ Rankings →All comparisons →

Child prodigies

Shirley TempleShirley TempleHollywood's number-one box-office star as a child, later a U.S.…Kelvin DoeKelvin DoeSelf-taught engineer who built a radio station from scrap at…Alexandra DovganAlexandra DovganWon the Grand Prix at the international Grand Piano Competition…Michael KearneyMichael KearneyBachelor's at 10 Years, 4 Months — Youngest U.S. College…
Child prodigies →

Play & come back tomorrow

Daily Genius Challenge · Guess the genius
Self-taught English scientist who discovered electromagnetic induction, the basis of the electric generator.
Tap your answer ↓
Which Genius Are You? Free IQ Test