As the story goes, Aegeus anxiously waited at Cape Sounion for his son Theseus to return from Crete, where he planned to dispatch the monster Minotaur or die trying. A signal had been pre-arranged: white sails upon return would indicate victory; black sails, defeat and mourning. For various reasons, Theseus forgot to change the sails to white and at first sight of the ship, grief-stricken Aegeus plunged into the sea which bears his name. This does appear to be the most likely spot for a fatal plunge.