  The various developments that occurred in the sixth and fifth centuries in how Greeks thought and spoke of the soul resulted in a very complex notion that strikes one as remarkably close to conceptions of the soul that we find in fourth century philosophical theories, notably Plato's.  There is thus some reason to think that the philosophical theories in question are best interpreted as working with, and on, the relatively non-theoretical notion of the soul that by the end of the fifth century has come to be embedded in ordinary language. In what follows our main concern will be to characterize some of the theories in question. But we should also attend, wherever this seems appropriate and helpful, to ways in which familiarity with the ordinary notion of the soul might enable us better to understand why a theory or an argument proceeds the way it does. In addition, we should note ways in which philosophical theories might seem to clarify and further articulate the ordinary notion. We begin with Plato, and with a question that is intimately tied up with the ordinary notion of the soul as it developed from the Homeric poems onwards, namely whether a person's soul does indeed survive the person's death.  