Δαμυσος
The swiftest runner of all the giants. He was buried at Pallene. When entrusted with the infant ACHILLES, the Centaur Chiron disinterred Damysus and took his heel-bone to replace the child's, which had been damaged by fire; this was why Achilles was so swift a runner himself. According to one of the legends about his death, his heel-bone came off as he was being pursued by Apollo. Achilles, fell, thus giving the god a chance to kill him.
{E2 DICTIONARY OF CLASSICAL MYTHOLOGY}