[Of the phoenix]
The phoenix is a bird of Arabia, so called either because its colouring is Phoenician purple, or because there is only one of its kind in the whole world.
It lives for upwards of five hundred years, and when it observes that it has grown old, it erects a funeral pyre for itself from small branches of aromatic plants, and having turned to face the rays of the sun, beating its wings, it deliberately fans the flames for itself and is consumed in the fire.
from The Aberdeen Bestiary.
Isidore of Seville [7th century CE] (Etymologies, Book 12, 7:22): The phoenix is a bird of Arabia, which gets its name from its purple (phoeniceus) color; or because it is singular and unique in the world and the Arabs call singular and unique phoenix. It lives for 500 years or more. When it sees that it has grown old it builds a pyre for itself from spices and twigs, and facing the rays of the rising sun ignites a fire and fans it with its wings, and rises again from its own ashes.
Guillaume le Clerc [13th century CE] (Bestiaire): There is a bird named the phoenix, which dwells in India and is never found elsewhere. This bird is always alone and without companion, for its like cannot be found, and there is no other bird which resembles it in habits or appearance. At the end of five hundred years it feels that it has grown old, and loads itself with many rare and precious spices, and flies from the desert away to the city of Leopolis. There, by some sign or other, the coming of the bird is announced to a priest of that city, who causes fagots to be gathered and placed upon a beautiful altar, erected for the bird. And so, as I have said, the bird, laden with spices, comes to the altar, and smiting upon the hard stone with its beak, it causes the flame to leap forth and set fire to the wood and the spices. When the fire is burning brightly, the phoenix lays itself upon the altar and is burned to dust and ashes. Then comes the priest and finds the ashes piled up, and separating them softly he finds within a little worm, which gives forth an odor sweeter than that of roses or of any other flower. The next day and the next the priest comes again, and on the third day he finds that the worm has become a full-grown and full-fledged bird, which bows low before him and flies away, glad and joyous, nor returns again before five hundred years. (Bestiaries and Lapidaries (London, 1896) Kuhns translation)
Bartholomaeus Anglicus [13th century CE] (De proprietatibus rerum, book 12): Phoenix is a bird, and there is but one of that kind in all the wide world. Therefore lewd men wonder thereof, and among the Arabs, there this bird is bred, he is called singular--alone. The philosopher speaketh of this bird and saith that phoenix is a bird without make, and liveth three hundred or five hundred years: when the which years are past, and he feeleth his own default and feebleness, he maketh a nest of right sweet-smelling sticks, that are full dry, and in summer when the western wind blows, the sticks and the nest are set on fire with burning heat of the sun, and burn strongly. Then this bird phoenix cometh willfully into the burning nest, and is there burnt to ashes among these burning sticks, and within three days a little worm is gendered of the ashes, and waxeth little and little, and taketh feathers and is shapen and turned to a bird. Ambrose saith the same in the Hexameron: Of the humours or ashes of phoenix ariseth a new bird and waxeth, and in space of time he is clothed with feathers and wings and restored into the kind of a bird, and is the most fairest bird that is, most like to the peacock in feathers, and loveth the wilderness, and gathereth his meat of clean grains and fruits. Alan speaketh of this bird and saith, that when the highest bishop Onyas builded a temple in the city of Heliopolis in Egypt, to the likeness of the temple in Jerusalem, on the first day of Easter, when he had gathered much sweet-smelling wood, and set it on fire upon the altar to offer sacrifice, to all men's sight such a bird came suddenly, and fell into the middle of the fire, and was burnt anon to ashes in the fire of the sacrifice, and the ashes abode there, and were busily kept and saved by the commandments of the priests, and within three days, of these ashes was bred a little worm, that took the shape of a bird at the last, and flew into the wilderness. (Mediaeval Lore from Bartholomew Anglicus (London, 1893/1905) Steele edition of 1905)
Sir John Mandeville [14th century CE] (Travels, chapter 7): In Egypt is the city of Heliopolis, that is to say, the city of the Sun. In that city there is a temple, made round after the shape of the Temple of Jerusalem. The priests of that temple have all their writings, under the date of the fowl that is clept phoenix; and there is none but one in all the world. And he cometh to burn himself upon the altar of that temple at the end of five hundred year; for so long he liveth. And at the five hundred years' end, the priests array their altar honestly, and put thereupon spices and sulphur vif and other things that will burn lightly; and then the bird phoenix cometh and burneth himself to ashes. And the first day next after, men find in the ashes a worm; and the second day next after, men find a bird quick and perfect; and the third day next after, he flieth his way. And so there is no more birds of that kind in all the world, but it alone, and truly that is a great miracle of God. And men may well liken that bird unto God, because that there ne is no God but one; and also, that our Lord arose from death to life the third day. This bird men see often-time fly in those countries; and he is not mickle more than an eagle. And he hath a crest of feathers upon his head more great than the peacock hath; and is neck his yellow after colour of an oriel that is a stone well shining, and his beak is coloured blue as ind; and his wings be of purple colour, and his tail is barred overthwart with green and yellow and red. And he is a full fair bird to look upon, against the sun, for he shineth full gloriously and nobly. (The Travels of Sir John Mandeville (1900) Macmillan edition of 1900)