Tithonos turned himself into a cicada. Eos bore him sons. The most famous of these was Memnon, who came to Troy from the eastern land of the Sun, Ethiopia, to aid his father’s family
Kerényi presents the Tithonos-cicada metamorphosis as the mythological culmination of immortality without renewal — the voice alone surviving when bodily power has been utterly withdrawn by age.
, The Gods of the Greeks, 1951thesis