It has been customary to take Grotius's book for the starting point of one of the best marked eras in the history of jurisprudence. Any account of the development of theories of justice is likely to begin the modern history of the subject with Grotius, and to put as a classical epoch a period designated as “from Grotius to Kant.” Any account of theories of law is likely to set off a period from the revived study of Roman law in the Italian universities of the twelfth century to Grotius, and another from Grotius to the breaking up of the eighteenth century law-of-nature school. In almost all accounts of the history of the science of law, Grotius stands as marking a turning point.