When contemporary dispossessed urban classes are figured as a “proletariat,” a potent historical analogy is activated in which the well-documented experience of the burgeoning industrial working classes of nineteenth-century Europe provides an implicit template for interpreting events and processes far removed in time and space. Yet Karl Marx's own deployment of the figure of the proletariat, which often provides the inspiration and model for such analogic moves, was itself in its own time already a complex historical analogy, invoking the social hierarchies of ancient Rome. Rethinking this doubly analogical intellectual history provides an occasion both for considering the uses and abuses of historical analogy, and for using a reflection on the original (Roman) proletarians as a conceptual lever for prying apart some outdated assumptions about the contemporary politics of certain propertyless urban populations, in southern Africa and beyond.