The phoenix is a mythical sacred firebird in ancient mythologies starting with the Egyptian, Phoenician and later the Greek Mythology.

Appearance and Abilities
A phoenix is a mythical bird with a tail of beautiful gold and red plumage . It has a 1,000 year life-cycle, and near the end the phoenix builds itself a nest of cinnamon twigs that it 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 Egypt city of Heliopolis . The bird was also said to regenerate when hurt or wounded by a foe, thus being almost immortal and invincible — it is also said that it can heal a person with a tear from its eyes and make them temporarily immune to death; a symbol of fire and divinity.

History
Although descriptions vary, the phoenix became popular in early Catholic art, literature and Catholic symbolism, as a symbol of Christ representing His resurrection, immortality, and life-after-death. One of the Early Catholic Church Fathers, Clement, related the following regarding the Phoenix in chapter 25 of The First Epistle of Clement:

Let us consider that wonderful sign [of the resurrection] which takes place in Eastern lands, that is, in Arabia and the countries round about. There is a certain bird which is called a phoenix. This is the only one of its kind, and lives five hundred years. And when the time of its dissolution draws near that it must die, it builds itself a nest of frankincense, and myrrh, and other spices, into which, when the time is fulfilled, it enters and dies. But as the flesh decays a certain kind of worm is produced, which, being nourished by the juices of the dead bird, brings forth feathers. Then, when it has acquired strength, it takes up that nest in which are the bones of its parent, and bearing these it passes from the land of Arabia into Egypt, to the city called Heliopolis