This chapter allows use the term international relations to refer to the seventeenth century because politics was then structured by families and their clan networking and mixed with elements of monarchy and aristocracy in every territory of Europe. The orientation towards utility for the sake of state benefit underlines the strategic impulse contained in the doctrine of reason of state that produces a different view for each state. In this connection, the doctrine of reason of state has not only a realistic impact but an ethical sense. The key issue regarding this new understanding is the doctrine of reason of state, which is finally an instrumental synthesis of Machiavelli's theory of power and virtue in the pivotal field of politics. The techniques of power differ considerably from the mainstream interpretations of how to organise social life. To operate successfully in the field of international politics means that the primary concern of each state to organise its military power.