Much folklore about dragons was believed throughout time. In Egyptian mythology, the god of the underworld, Osiris, is sometimes represented by a dragon. In Greek mythology, dragons are always guarding something or eating someone. In European mythology, a dragon is a serpent-like legendary creature. In both Eastern and Western mythology, the dragon is believed to be responsible for eclipses. In Bulgarian legend, dragons are three headed, winged beings with snake's bodies. There is also a white dragon, which according to legend can transform into a bird called O-Goncho. The dragon also plays a vital role in Arthurian legend. In Romanian folklore, even the snake, which in certain conditions, has the ability to turn into a dragon, has a strong malefic meaning. The ancient Greeks and Romans, who revered dragons for their wisdom but feared them for their tremendous powers, shared this belief. Similarly, in the Babylonian creation myth, Tiamat the embodiment of chaos is portrayed as a terrible dragon. This myth is almost as hard to kill as the dragon itself was. For this reason, the dragon symbol is the sign of authority, often being worn on the robes of the Imperial family and nobility. Dragons have long been considered evil, maiden-stealing, village destroying, fire-breathing beasts. This lead to many brave knights attempting to hunt down and slay dragons, as recounted in many medieval writings. When knights began inventing stories about them defeating such dragons, the dragon and knighthood peak was reached. Almost every country in the world as some sort of dragon story. Legends and myths are filled with stories of dragons. In European mythology, a dragon is a serpent-like legendary creature. In many legends dragons personify evil, and are vicious beasts who live to wreak havoc and must be pacified by human sacrifice. One of the most feared monsters of the Greeks and Romans was the Hydra, a dragon with multiple heads and poisonous breath. In fairy tales and in medieval poetry in the Western world dragons are dangerous, untrustworthy creatures. Medieval people liked to scare each other with dragons. All peopel are drawn by the dragon's aura of mystery, its ancient magic, its nobility; its awesome might and power.