The true logos in Plato's Timaeus, unlike in most of his dialogues, depends on personal adequacy of the truth of the people who take part in the meeting. Moreover family genealogy, myth and past as mimetic instance also endow political and historical overtones to the problem of the true /probable speech (alethinos/eikos logos).Keywords: Argument, Athens, Atlantis, Egypt, logos, myth, narrative, story, truth.