In Egyptian, Greek, and Roman mythology, the peacock feathers were considered much like the evil eye. They were all seeing.
In the western world, the peacock was referred to as a slayer of serpents. The shimmering colors of his tail feathers were explained by his supposed ability to transform snake venom into solar iridescence. The peacock has the ability to eat poisonous snakes without harm.
Alchemists thought the fan of the peacock (cauda pavonis) is associated with certain texts and images that are useful in turning base metals into gold.
The Greeks dedicated the peacock to Juno, the goddess of sky and stars, in recognition of the golden circles and blue background of the peacock’s tail.
“By the Peacock” was a sacred oath, because the peacock was thought to have the power of resurrection, like the Phoenix. A necklace of Amethyst, peacock feathers, and swallow feathers were a talisman to protect its wearer from witches and sorcerers.