In Greek mythology, Tithonus was a son or brother of Laomedon the king of Troy by a river nymph. He was made immortal by Zeus at the request of the goddess Eos who loved him and he had by her the hero Memnon.. However, she neglected to ask that Tithonus be given the gift of eternal youth, so that he withered away in an ever increasing decrepitude. Eventually, he begged Eos to revoke her gift, and the goddess changed him into a grasshopper. The name Tithonus thus became proverbial for a decrepit old man. Research Tithonus