It is a widespread opinion that modern jurisprudence was shaped first of all by the tradition of Roman law. In this article author tries to explain why ancient Greek legal thought should be equally important. As an example he considers the evolution and the different meanings of the concept of nomos. Four issues are presented in this paper. First, nomos in the political philosophy of Carl Schmitt and Giorgio Agamben. Secondly, nomos in one of Pindar’s poems. Thirdly, the distinction between physis and nomos made by the sophists. Fourthly, thesmos, nomos and psephisma in the legislative practice of Athenian ekklesia.