Not very long ago, Plato'sSophistwas often presented as a dialogue devoted to the problem of being and not-being, entangled with limited success in an inquiry into the nature of the sophist. Thanks to the renewal of interest in the dramatic form of Plato's dialogues, recent works have shown that this entanglement is far from ill-conceived or anecdotal. However, the inquiry into the sophist is itself introduced by another question, concerning the nature of the Stranger from Elea himself. I would like (...) to show that this question and the way in which it is raised in the prologue may themselves shed light on the relations between the many threads which run across this very complex dialogue. (shrink)