English summary: The dual aim of this essay is to strive to provide a critique of the modern concept of myth while rendering - in all their semantic depth and with their poetic and social functions - the fictional creations brought into being by the Greeks' memorial relations with the past of the most mythical of their colonies. French description: Cyrene au ciel perce, Cyrene et ses trois recoltes annuelles de fruits, Cyrene nourriciere de troupeaux...