This module aims to provide a critical overview of the main legal systems of Antiquity. Stress is put upon the constitutional organization of both the Greek city-state and Rome, through a comparative analysis of the social and political events which led to the birth and the evolution of the legal organization of these communities. The module’s plan is divided in two parts, corresponding to the ancient Greek and the Roman Law. The first part extends from the Minoan and the Spartan Constitutions to the Athenian one. The second part examines the consecutive political systems of Rome: the Kingship, the Republic and the Principate. The whole plan is completed with some elements of Greek and Roman private law.