In mythology, the peacock was the sacred bird of Hera, who drove through the air in a chariot drawn by peacocks. How the peacock came to have eyes on its tail is the subject of a Greek myth that began one day when Zeus turned his illicit love Io into a white cow to disguise her from his wife, Hera, who nearly caught them together. Hera was suspicious and put the heifer under the guardianship of Argus, who tethered the animal to an olive tree. Argus was ideally suited to the task of watchman, since he had 100 eyes, of which only two were resting at a time while the others kept a look out. Wherever Argus stood, he could always keep several of his eyes on Io.
Zeus sent his son Hermes to release Io from her captivity. Hermes swooped down to Earth and spent the day with Argus, telling him stories and playing his reed pipes until, one by one, the eyes of Argus became sleepy and began to close. When Argus was finally asleep, Hermes lopped off his head and released the heifer. Hera placed the eyes of Argus on the tail of the peacock.
The constellation’s brightest star, second-magnitude Alpha Pavonis, is called Peacock.