Since its early origins, just war discourse has had two contrasting functions: it has sought to speak law and morals to power, and thus to restrain the use of force, but it has also served to authorize and legitimize the use of force. Critical voices have recently alerted to the increasing use of authorization and legitimization in a broader context of hegemonic and unilateral appropriations of just war discourse. In this article, I show that such critiques of just war have (...) a long history, and reconstruct the powerful challenge that two of the foremost international jurists of the Enlightenment—Christian Wolff and Emer de Vattel—mounted against early modern accounts of just war. Their neglected theory of “regular war” helps us to recover a sense of what a truly pluralist and anti-hegemonic doctrine of ius ad bellum may look like, and reveals a deep tension in the just war tradition between the criteria of political authority and just cause. (shrink)