The phoenix is a mythical sacred firebird that originated in Persian mythology, ancient Phoenician mythology (according to Sanchuniathon), Chinese mythology, Egyptian religion and later Greek mythology.

A phoenix is a mythical bird that is a fire spirit with a colorful plumage and a tail of gold and scarlet (or purple, blue, and green according to some legends). It has a 500 to 1,000 year life-cycle, near the end of which it builds itself a nest of twigs that then ignites; both nest and bird burn fiercely and are reduced to ashes, from which a new, young phoenix or phoenix egg arises, reborn anew to live again. The new phoenix is destined to live as long as its old self. In some stories, the new phoenix embalms the ashes of its old self in an egg made of myrrh and deposits it in the Egyptian city of Heliopolis (Greek for sun-city). It is said that the bird's cry is that of a beautiful song. In very few stories they are able to change into people.

The Roman poet Ovid wrote the following about the phoenix:

Most beings spring from other individuals; but there is a certain kind which reproduces itself. The Assyrians call it the Phoenix. It does not live on fruit or flowers, but on frankincense and odoriferous gums. When it has lived five hundred years, it builds itself a nest in the branches of an oak, or on the top of a palm tree. In this it collects cinnamon, and spikenard, and myrrh, and of these materials builds a pile on which it deposits itself, and dying, breathes out its last breath amidst odors. From the body of the parent bird, a young Phoenix issues forth, destined to live as long a life as its predecessor. When this has grown up and gained sufficient strength, it lifts its nest from the tree (its own cradle and its parent's sepulchre), and carries it to the city of Heliopolis in Egypt, and deposits it in the temple of the Sun.

French author Voltaire thus described the phoenix:

It was of the size of an eagle, but its eyes were as mild and tender as those of the eagle are fierce and threatening. Its beak was the color of a rose, and seemed to resemble, in some measure, the beautiful mouth of Formosante. Its neck resembled all the colors of the rainbow, but more brilliant and lively. A thousand shades of gold glistened on its plumage. Its feet seemed a mixture of purple and silver; and the tail of those beautiful birds which were afterwards fixed to the car of Juno, did not come near the beauty of its tail.