A member of The Five, or Mastajeer's Five, were specially handpicked by Mastajeer during the conception of the Agency. They were specifically trained in the case that The Agency would fall and Marga and Margan, the daughter and son of Mastajeer, were killed. They now take up residence away from the Republic on a now independent Mido.
Not truly apocalyptic, I know, but I can't help but think that even if most of the world fell to ruin, we'd somehow still manage to build something shiny and bright and wasteful with what's left. This, for the record, is not necessarily a bad thing.