Greek Myth

In Greek mythology, Achilles was the greatest warrior in Greek history. He was the son of the nymph Thetis, who tried to make him immortal by dipping him in the river Styx. She was almost successful, however, she held him by his heel and did not submerge that part of his body. This was the only point on his body that was said to be vulnerable. He went on to fight in the Trojan war, besting Troy's best fighter, Hector, in one on one combat. Prior to the sacking of Troy and the Trojan horse, he was shot with an arrow in the ankle by Paris, Hector's brother, and killed.

Modern References

The part of the ankle that Achilles was said to have been shot through is still in use today. The anatomical name for the muscle that connects the base of a person's foot to the rest of their leg is still referred to as the Achilles Tendon. The term an "achilles heel" is also used to reference a person's one fatal flaw or down fall.