Contrary to what one might expect, the problem of the justifi cation of punishment is relatively new. It was the explanation of the role of punishment that was problematic, not the issue of the state’s legitimization of punishment. The issue of punishment has been greatly infl uenced by the evolution of liberal and positivist philosophies and particularly by the marginalization of concepts of ius natural. This article describes the evolution of penal law philosophy and its infl uence on the state of the modern science of penal law as well as reforms of the penal law in Poland. The penal law of the 18th century was infl uenced by the idea of natural law – it perceived punishment as a necessity following a certain natural order. The philosophy of...