Ovid
The Metamorphoses of Ovid, Book I (Fable. 11)
The Earth, being warmed by the heat of the sun, produces many monsters: among others, the serpent Python, which Apollo kills with his arrows. To establish a memorial of this event, he institutes the Pythian games, and adopts the surname of Pythius.

The Earth of her own accord brought forth other animals of different forms; after that the former moisture was thoroughly heated by the rays of the sun, and the mud and the wet fens fermented with the heat; and the fruitful seeds of things nourished by the enlivening soil, as in the womb of a mother, grew, and, in lapse of time, assumed some regular shape. Thus, when the seven-streamed Nile70 has forsaken the oozy fields, and has returned its waters to their ancient channel, and the fresh mud has been heated with the æthereal sun, the laborers, on turning up the clods, meet with very many animals, and among them, some just begun at the very moment of their formation, and some they see still imperfect, and as yet destitute of some of their limbs; and often, in the same body, is one part animated, the other part is coarse earth. For when moisture and heat have been subjected to a due mixture, they conceive; and all things arise from these two.

And although fire is the antagonist of heat, yet a moist vapor creates all things, and this discordant concord is suited for generation; when, therefore, the Earth, covered with mud by the late deluge, was thoroughly heated by the æthereal sunshine and a penetrating warmth, it produced species of creatures innumerable; and partly restored the former shapes, and partly gave birth to new monsters. She, indeed, might have been unwilling, but then she produced thee as well, thou enormous Python; and thou, unheard-of serpent, wast a source of terror to this new race of men, so vast a part of a mountain didst thou occupy.

The God that bears the bow, and that had never before used such arms, but against the deer and the timorous goats, destroyed him, overwhelmed with a thousand arrows, his quiver being well-nigh exhausted, as the venom oozed forth through the black wounds; and that length of time might not efface the fame of the deed, he instituted sacred games,71 with contests famed in story, called “Pythia,” from the name of the serpent so conquered. In these, whosoever of the young men conquered in boxing, in running, or in chariot-racing, received the honor of a crown of beechen leaves.72 As yet the laurel existed not, and Phœbus used to bind his temples, graceful with long hair, with garlands from any tree.

Footnotes:

70. The seven-streamed Nile.]—Ver. 423. The river Nile discharges itself into the sea by seven mouths. It is remarkable for its inundations, which happen regularly every year, and overflow the whole country of Egypt. To this is chiefly owing the extraordinary fertility of the soil of that country; for when the waters subside, they leave behind them great quantities of mud, which, settling upon the land, enrich it, and continually reinvigorate it.

71. Instituted sacred games.]—Ver. 446. Yet Pausanias, in his Corinthiaca, tells us that they were instituted by Diomedes; others, again, say by Eurylochus the Thessalian; and others, by Amphictyon, or Adrastus. The Pythian games were celebrated near Delphi, on the Crissæan plain, which contained a race-course, a stadium of 1000 feet in length, and a theatre, in which the musical contests took place. They were once held at Athens, by the advice of Demetrius Poliorcetes, because the Ætolians were in possession of the passes round Delphi. They were most probably originally a religious ceremonial, and were perhaps only a musical contest, which consisted in singing a hymn in honor of the Pythian God, accompanied by the music of the cithara. In later times, gymnastic and equestrian games and exercises were introduced there. Previously to the 48th Olympiad, the Pythian games had been celebrated at the end of every eighth year; after that period they were held at the end of every fourth year. When they ceased to be solemnized is unknown; but in the time of the Emperor Julian they still continued to be held.

72. Crown of beechen leaves.]—Ver. 449. This was the prize which was originally given to the conquerors in the Pythian games. In later times, as Ovid tells us, the prize of the victor was a laurel chaplet, together with the palm branch, symbolical of his victory.