Ahasuerus is the Wandering Jew, whose main characteristic was that he had to wander restlessly over the earth till the end of the world. The fact that this particular name occurred to the author justifies us in following his trail.
Jung identifies Ahasuerus as the archetypal Wandering Jew and uses the analysand’s spontaneous association to the name as a portal into the dynamics of unconscious personality formation.
, Symbols of Transformation, 1952thesis