This PhD dissertation is a study on the international politics of outlawing, an international politics of criminalization and proscription. Starting from the reading of some of the US Memos on the War on Terror, and influenced by Jacques Derrida s quasi-concept of trace, as well as by Carl Schmitt s insight on the exception/rule dualism, this work follows certain traces which are constitutive of those documents and, most importantly, of the unlawful combatant status of those detainees as determined therein. Thus, from these constitutive traces of the category of unlawful combatant, this work identifies the traces of the category of the pirate within the political-legal architecture of the international order, and, from them, those of an exceptional alterity which Schmitt has identified as one of an outlaw enemy, or an outlaw of humanity. In this regard, it focuses on the exceptional alterity and space-time of the pirate, analyzing his ambiguous political-legal status – as both an international outlaw and an enemy of humankind (hostis humani generis) –, as well as his outlawry from the space-time of the modern international system and of humanity. From this analysis, then, and influenced by R. B. J. Walker s most recent studies on the constitutive outside and the exclusionary sovereign practices of the modern international system, it identifies and comments on the traces, most especially on the contemporary traces, of the international politics of criminalization and proscription. And then, influenced by that Derridian quasi-concept of trace, this PhD work concludes positioning itself in relation to this international politics of outlawing; that is, tracing the Outlaw of Humanity.