Henri de Boulainvilliers (; 21 October 1658, Saint-Saire, Normandy – 23 January 1722, Paris) was a French nobleman, writer and historian. He was educated at the College of Juilly; he served in the army until 1697.
Primarily remembered as an early modern historian of France, Boulainvilliers also published an early French translation of Spinoza's Ethics and wrote on topics as diverse as astrology, physics, philosophy and theology. His theory that French nobility is of Germanic origins while the Third Estate is of Celtic Origin inspired Arthur de Gobineau.
The Comte de Boulainvilliers traced his lineage to the House of Croÿ, to Jean de Croÿ, sire de Clery et de Boulainviller, who died in the Battle of Poitiers (1356). At the time of his birth, however, the family's fortune had declined significantly. Much of Boulainvilliers' historical work and political life centered on the decline of the nobility.
Education
In 1669, Henri de Boulainvilliers went to study at the Collège de Juilly, one of the most famous schools of the Congregation of the Oratory of Philip Neri. Exact sciences, history and geography were taught there.
The philosopher Malebranche being one of the great educators at the Oratory, cartesianism was allowed reference in the classroom from 1662 until 1675 when it was banned by Royal decree.
In 1673, Henry studied rhetoric with his teacher Richard Simon, who was excluded from the Oratory (1678) because of his critical Bible studies.
