This book brings to light the way in which basic ideas of the Enlightenment were invented and how a French aristocrat discovered the foundations of modern democracies. A life devoted to the study of law, science, and the histories of all societies made it possible for Montesquieu to show how liberty was the thing most at stake in political thought.

Since the last biography of Montesquieu in English (Shackleton, Oxford, 1961) Montesquieu scholarship has been entirely renewed, culminating in a critical edition of his complete works in twenty-two volumes that is nearing completion. Since 1998, this new edition of the complete works has considerably modified what was known about Montesquieu and his procedures, eliciting new translations and further studies. Additionally, several thousand manuscript pages were made public in 1994 and continue to generate further scholarly inquiry. The author of this compact biography, originally published by Gallimard 2017, is the director of the critical edition of the works and the most qualified scholar of Montesquieu. At once an introduction to Montesquieu's thought and a synthesis of current knowledge about his life and work, this book is full of insights and revised judgements about Montesquieu and how his political philosophy helped thrust Enlightenment onto the European agenda.