An account of the negotiations inside the Parlement de Paris: Claude Guillaume Lambert's diary.

The article focuses on the diary of Claude Guillaume II Lambert, a mid-18th-century councillor of the Parlement de Paris, which provides rare insight into the internal debates, factional dynamics, and political strategies within this sovereign court between 1749 and 1751. Lambert’s diary reveals the parlement’s dual judicial and administrative roles, its use of majority voting, and the complex interplay between magistrates who either supported royal authority or opposed it, particularly during disputes over taxation such as the vingtième and religious controversies involving the clergy and Jansenists. The diary illustrates the parlement as a political arena where magistrates negotiated their constitutionalist claims, balancing service to the monarchy with defense of perceived public and institutional interests, and highlights the gradual radicalization of opposition leading up to the parlement’s exile in 1753. This source challenges previous views of the parlement as a monolithic opposition and instead portrays it as a fragmented but politically engaged body navigating the tensions of royal absolutism and emerging public opinion.