Nevertheless, the "Moroccan Letters" (1789), published posthumously, are the ones that give the most importance to the literary production of Cadalso. According to a very cultivated model in France (for example, the Persian Letters of Montesquieu), the author composes a book with ninety letters written between Gazel, moor that visits Spain, his Moroccan teacher and friend Ben-Beley, and Nuño Núñez, Christian friend of Gazel. They comment on the historical past of Spain and its present life, and they judge the work of the governors and the customs of the country.