In the Luso/Portuguese world, after 1760, the adoption and dissemination of certain jansenistic ideas was supported by the State. In its crusade against the Jesuits, the Portuguese crown systematically replaced the works that had an Ultramontane ecclesiologic tendency by others, with a Gallican character. They also supported the abandon of probabilism, considered the source of the relaxed moral disseminated by the Jesuits. It was mostly through these moral and ecclesiologic aspects that the jansenistic tendencies in Portuguese America were manifested. Using mainly Episcopal sources I will analyze some of the characteristics of Jansenism and, in a more general way, of reformer thought in Brazil during the last decades of the 18th century.