Britannica Sources used in this answer

What did Montesquieu learn from his visit to England?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Oval portrait print of Montesquieu by Pierre Michel Alix after Jean Francois Garnerey, showing Montesquieu with long curly white hair and a fur-trimmed robe, facing forward. — Montesquieu Montesquieu.

Montesquieu’s stay in England from 1729 to 1731 was one of the most formative periods of his life. During this time, he immersed himself in English society and politics by attending parliamentary debates, reading political journals, and becoming a fellow of the Royal Society and a Freemason.1

His observations of the English constitution served as the primary inspiration for his influential theory of the [separation of powers]. Montesquieu viewed the English system—specifically through the lens of the Tory opposition to the Whig leader Robert Walpole—as a model where legislative, executive, and judicial powers were divided among independent bodies to effectively safeguard [liberty]. Although his interpretation of English political realities has been disputed by modern scholars, his analysis became a cornerstone of his masterpiece, The Spirit of Laws, and profoundly influenced the framing of the U.S. Constitution.234