After achieving independence from the Spanish colonial dominion, a process of political development began in Mexico, tending towards setting up the Nation-State while creating and consolidating its own institutions following the liberal political model. All this was to lead to the start of the parliamentarization of Mexican political life and the changing of the ruling classes – with certain filtering – opening up the way to a new political/parliamentary elite linked to diverse liberal options. This article sets out to propose some first thoughts and debate around one of the most overlooked aspects of the first liberalism in Mexico: the political actors of the Mexican parliamentary stages that saw the consolidation process of the liberal State model that was representative in the country. To do so, as one of the main research methodologies in terms of the parliamentary actors, basic biographical profiles and prosopographical analysis are set out in this article. In this case, partial results are presented of a specific case study, from which partial conclusions and comparative guidelines are presented. This case focuses on parliamentary representation of the State of Puebla in the national Mexican congresses, during the period 1833-1856.