The influence of French constitutionalism is evident in the period of constitutional reaffirmation in Spain during the reign of Isabel II. This moderantist constitutional phase is committed to the «theory of the internal constitution» and takes as its point of departure the historical recognition of two basic principles that articulate (except for the democratic constitution of 1869 and the federal project of 1873) the Spanish constitutional and political reality: the Monarchy and Parliament. The shared sovereignty of the King and Parliament, together with a regime of collaboration between the powers arises from this reality. The French moderantism of the Charters of 1814 and 1830 is reflected in our Isabelline texts and the attempts ...