According to Greek mythology, Achilles was the son of a sea nymph named Thetis and a mortal named Peleus. He was dipped head first into the Styx, a powerful body of water, which made him invincible. The problem was, the heel by which he was held was not submerged. He was later killed by an arrow to this weak heel. Since, the term 'achilles heel' has been used to refer to a weakness. As a name, Achilles seldom makes an appearance.
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