Accounts of the historical origins of international humanitarian law (IHL) routinely assume that the emergence of humanity as a constraint on the waging of war, coinciding as it did with a general rise of humanitarianism in the nineteenth century, reflected a growing commitment to a universally shared notion of human dignity. That assumption is fallacious. Those who have been mythologised as champions of humanity as constraint, including Henri Dunant and Francis Lieber, were products of their era. IHL’s ‘original sin’ was to only extend constraints of humanity to so-called civilised nations in their wars inter se. These same constraints were not intended to apply to indigenous and other colonised populations – those assumed to be ‘uncivilised’ – often referred to as such with the pejoratives ‘savages’ and/or ‘barbarians’. The exclusion of emergent constraints on the grounds of racism and colonialism is evident in the language of the early IHL treaties. It has taken many decades for the international community to overcome the exclusions of the legal protection of emergent IHL and some would argue that the tendency for exclusion is still evident in the dehumanising of the other in the Global War on Terror.