  Within the field of global justice, issues concerning war have one of the longest histories. The just war framework has been influential in setting the terms of much debate about the proper use of force in international affairs. Aristotle, Cicero, Augustine and Thomas Aquinas offered some of the earliest accounts of the criteria that should be met for war to be justified. Two areas have been especially thoroughly studied (1) the conditions under which entry into the war is justified (Jus Ad Bellum) and (2) the conditions for fair conduct within the war (Jus In Bello).  While having a just cause is standardly held to be a necessary condition for a war to be justified, it is not sufficient. Theorists often disagree about which additional conditions must be satisfied for a war to be characterized as a just war. The most common additional conditions proposed are that the war should be undertaken by a proper authority, with the right intentions, when the war would follow requirements of proportionality (the ends to be secured would warrant going to war), only as a last resort, and when there are reasonable prospects of success. On traditional accounts of just war theory all conditions must be met, but more contemporary theorists challenge whether they are all necessary (Mellow 2006, Moellendorf 2002).