Andre Morellet (1727-1819), a representative but neglected figure of the eighteenth-century republic of letters, contributed to the Encyclopedie and collaborated with royal ministers. He frequented Parisian salons and supported liberty of conscience and commerce. He not only participated in the campaign to reform the Ancien Regime but also witnessed and documented its destruction during the 1790s. Morellet’s life and works provide a splendid case study for the reconsideration of perennial questions about the Enlightenment and the Revolution.