The dragon (from Ancient Greek δράκων - drakōn, "a serpent of huge size, a python, a dragon") is a mythical creature typically depicted as a gigantic and powerful serpent or other reptile with magical or spiritual qualities.
The earliest record of a dragon-like creature in the Ancient Western civilisations is in the Biblical works of Job (26:13), and Isaiah (27:1) where it is called Nachash Bare'ach, or a "Pole Serpent". This is identified in the Midrash as Leviathan. In Jewish astronomy this is also identified with the North Pole, the star Thuban which, around 4,500 years ago, was the star in the Draco constellation's "tail".However this can also have been either the celestial pole or the ecliptic pole. The ancient observers noted that Draco was at the top of the celestial pole, giving the appearance that stars were "hanging" from it, and in Hebrew it is referred to as Teli (semantically cognate with the Greek tele (τῆλε), far, as indeed stars are a long distance away), from talah - to hang.Hebrew writers in Arabic locations identified the Teli as Al Jaz'har, which is a Persian word for a "knot" or a "node" because of the intersection of the inclination of the orbit of a planet from the elliptic that forms two such nodes. In modern astronomy these are called the ascending node and the descending node, but in the medieval astronomy they were referred to as "dragon's head" and "dragon's tail".
In Ancient Greece the first mention of a dragon is derived from the Iliad where Agamemnon is described as having a blue dragon motif on his sword belt and a three-headed dragon emblem on his breast plate