It is well known that the expression and concept of ‘Enlightenment constitutionalism’ does not exist in current historiography. Given that the language of historiography until recently also lacked the concept of Old Regime constitutionalism, this should not be particularly surprising. Still, it seems very difficult not to employ it, or some similar term, if one really wishes to understand the deeper structures, nature, and true message of the Scienza della legislazione. The concept of Enlightenment constitutionalism of course has to be explained and its meaning specified beginning from its historical context, that is the crucial period between the two great revolutions, the American and the French, as well as the novel elements which characterized the most important parts of that grandiose project. This is what the previous chapters tried to do, examining decisive questions like the umpteenth metamorphosis of natural law brought about by Enlightenment thinkers who put the question of human rights at the core of the political debate of the late eighteenth century, and by exploring the unexpected consequences of that increasingly tangled nexus between rights to liberty and the principle of equality for ways of thinking about politics, morality, and religion.