Henri de Boulainvilliers, count de Saint-Saire, (born Oct. 21, 1658, Saint-Saire, Fr.—died Jan. 23, 1722, Paris), French historian and political writer who set forth a broad cultural conception of philosophical history that influenced intellectual developments in the 18th century. He was among the first modern historians to claim that historical studies can supply the tools for analyzing the state of present society.
Boulainvilliers was trained in classical studies, French history, and the sciences. He read widely and was familiar with the works of Descartes, Spinoza, Newton, and Locke. He was in military service for nine years after 1679 and subsequently set out to win back his family’s fortune and to cultivate his own literary talents.
Boulainvilliers’s ideas of history were developed in a number of treatises (all published posthumously), among which État de la France, 3 vol. (1727–28; “The State of France”) traced the history of the French monarchy to the end of Louis XIV’s reign. In this work, considered to be his finest, he emphasized a socio-psychological explanation of events and a broad conception of institutional development. He defended the French nobility in the Essai sur la noblesse de France (ed. 1732; “Treatise on the French Nobility”), in which he analyzed the decline of the French nobility, attacked the absolutism of Louis XIV, and examined the legitimacy of French political institutions.
In his writings, Boulainvilliers worked out a theory of comparative historical study, based on a critique of natural law and the demand for a “science” of politics and reform, which approached the later writings of Montesquieu.
In addition to writing on history, Boulainvilliers also wrote on philosophy in L’Idée d’un système général de la nature (1683); on comparative religions in Histoire de la religion et de la philosophie ancienne (1700?); and on occultism and astrology, contained in several miscellaneous works.