Two centuries ago, Brazil became independent through constitutionalism, a controversial period where several proposals in normative form, in addition to the project of the Constituent Assembly and the Council of State, were presented for the constitution of the Brazilian Empire. The objective of this dissertation is to analyze these projects and constitutional basis dated between 1822 and 1824, comparing their government structures and individual liberties from a theoretical perspective contemporary to the facts, specifically the ideas of the French-Swiss publicist Benjamin Constant. For this, deductive and New History methods were used, considering the perspective of António Manuel Hespanha, and precepts and techniques of Comparative Law. The research is justified by the absence of exploratory studies of other published normative formulations and the necessary addition of other elements and new readings for a better understanding of the public debate around Brazilian constitutional history.