As it seems to be clear from the Pyramid Texts, the god Seth is a fundamentally polysemic character. This comes from the fact that a “new” Seth, the murderer of Osiris according to the Heliopolitan theology, has been superposed to the older Seth, the god of Nubet (Ombos, Nagada), the protagonist of the historiographic myth together with Horus of Nekhen (Hieraconpolis). This article try to show how this double character of Seth has been intentionally used against whoever would contest the pharaonic power.