FTP, name this 1762 work on "principles of political right" which begins by asserting that "man is born free, but is everywhere in chains" and which advocates the titular covenant for legitimate political authority, a book by Jean Jacques-Rousseau.
Its final book discusses the effectiveness of the three types of Roman comitia before distinguishing between the "religion of man," "religion of the citizen," and a third flawed religion of "civil and religious laws."  The first book ends with a discussion of "real property" that includes the example of Balboa claiming the New World for Castile, and insists against Grotius that we must always go back to a first convention.  The author concludes that an aristocracy is the most stable form of government, but is more concerned with the general will of the grouping of all citizens, which he terms the "sovereign."  FTP, name this 1762 work on "principles of political right" which begins by asserting that "man is born free, but is everywhere in chains" and which advocates the titular covenant for legitimate political authority, a book by Jean Jacques-Rousseau.
Its final book discusses the effectiveness of the three types of Roman comitia before distinguishing between the "religion of man," "religion of the citizen," and a third flawed religion of "civil and religious laws."  
On The Social Contract or Du Contrat Social