Jacques Guermeur, lawyer and judge, was a deputy from the Finistère to the National Convention. At his death in 1798, at the age of forty-eight, he left a Library of 249 titles, and more than 900 volumes. Using the death inventory, this article examines this formidable Library in all its facets, comparing it to other libraries of lawyers from Brittany at the end of the eighteenth century, and it presents as well the « amis de Quimperlé » the buyers of the books and reviews of Guermeur. Taking into consideration the cultural and social environment, one might reasonably suppose that the belated involvement of Guermeur in French political life in 1792 was a consequence more of the pressure and support of his friends than froma revolutionary fervor, a sentiment that would in the long run nourish his reading.