The phoenix is one of the most popular legends of all history, a myth which is still one of the symbols of today. We find the first references to Egypt, in the personification of the solar divinity received the name of Bennu, presided over the daily race of the single city of Heliopolis. Although Plutarch referred to the Phoenix as being of Ethiopian origin. As a good myth no one was sure what it really looked like, although it was generally described as a large, eagle-like bird of great beauty, with the head of a pheasant, the beak of a raptor, red wings, and incomparable splendour. The Greeks called it Phoenicopterus (red- winged), nowadays zoologists have adopted this name to designate the Flamingos. The Romans referred to it as Sacrum Soli. Over time the myth was adapted to different cultures, but the initial features remained practically unchanged, apart from its beauty it was a bird that lived between 500 and 1000 years, as soon as it was close to its end it made a nest with wood and aromatic resins that was lit with the exposure of the sun's rays, immolating itself and on the third day it rose from its ashes. This symbol of the periodicity of death-resurrection has been maintained in religions, in philosophy and in literature. In Rome, it represented the continually renewed life force of the empire, and in this sense, it was depicted on coins and mosaics. In Christian symbolism, it was adopted as the basis of rebirth, in this case the bird was born in Eden under the forbidden tree and when Adam and Eve were expelled from paradise, a spark from the angel's flaming sword fell on the bird and it then received the gift of immortality through fire. In Christian texts it is mentioned in the letter to the Corinthians by Clement of Rome 95-98 AD, or Tertullian in De Resurreccione mortuorum, in this sense of death resurrection was adopted especially in the Middle Ages in paintings depicting renewed life, and although it was used at the end of the 18th century in the cathedral of Barcelona in the Ephemeral Cenotaph of Charles III 1790. In alchemy, transmutation takes place in the Atanor (Tannu = furnace in Arabic), where the phoenix symbolises the last phase of the alchemical process of obtaining the philosopher's stone, born of the alchemical fire of transmutation.