The Republic of Venice is a significant presence in the Gregorio Leti's (1630-1701) provocative editorial practices. The connection with Venice is central in his personal network and in his informal activity as a political informer. Moreover, Venice is linked to his editorial commitment. The reference to Venice, however, characterizes Leti also as an author. In his historical and political writings, the praise of Venice is inspired by the traditional themes of the political ‘myth' of Venice. The eulogy of the Serenissima nevertheless functions as an apparent framework of reference, crossed by dissonances and anomalies. In this perspective, his analysis of the religious dynamics within the Venetian society and of the historical relations between Venice and the papacy is very significant. This paper debates the dissident issues of Leti's historiography focusing on the polemical analogies between Venice and Geneva in Leti's representation of Venetian ‘freedom' as a specific modality of the anti-Roman ‘heresy'.