In this chapter I argue that self-defense is permissible against an unjust attack, but that any lethal harm must be, in Aquinas’s phrase, praeter intentionem, outside the intention of the defender. I argue that public authorities must also not intend death, but that because of the nature of the political task, public officials are capacitated to use force to a greater extent and in greater measure than are private individuals.

In this Chapter I argue, contrary to Aquinas and modern day defenders, that capital punishment is unjustified killing. Capital punishment is not required by retributivism, and Aqunas’s arguments defending the practice are unconvincing.

Chapter 4 surveys a wide range of friendly and hostile interstate relations in ancient societies, where war was often the normal state of affairs. Notwithstanding the numerous conflicts, polities tried in the end, through alliances and diplomatic relations, to establish peaceful relations in view of political stability and economic prosperity. The chapter analyses hospitality rules regarding foreigners, treaties between polities and the establishment of diplomatic relations, which emerged as an international system in the ancient Near East during the mid-fourteenth century bce. An alternative to diplomacy in conflict management, typical of the Greek world, was arbitration and mediation with the help of a third party. In a final section, the chapter outlines how states, when diplomacy failed, started a war procedurally. In conclusion, the chapter argues that, in the absence of an international court, the enforcement of diplomatic rules and treaties was in many ancient societies ensured by the supranational authority of the gods.