Legend says that when Achilles was an infant, his mother dipped him in the waters of the River Styx, thus making him invulnerable except for where his mother held onto him ​ — the proverbial Achilles ’ heel.
Legendi järgi oli ema kastnud vastsündinud Achilleuse Styxi jõe vetesse, et teha poega haavamatuks; vaid kannad, millest ema kinni hoidis, jäid haavatavaks — millest tuleneb ka väljend Achilleuse kand.