Seventeenth-Century Scotism and the War Just on Both Sides

Can a war can be just on both sides? Within the Western just war tradition, Catholic theologians traditionally held wars on both sides to be logically impossible. This view went unchallenged until questioned by two seventeenth-century Irish Franciscan Scotists. These were Aodh Mac Cathmhaoil (Hugo Cavellus) and John Punch. In this paper I lay out the Scotist theological grounds that led them to admit to the possibility of wars just on both sides. I also conjecture on possible reasons why Punch refrained from revising traditional just war theory in light of his own far-reaching theological conclusions.