Scorpio is the eighth astrological sign in the Zodiac, originating from the constellation of Scorpius.There are several myths which are often associated with Scorpio. Known in the Roman mythology as Pluto, Hades is often associated with Scorpio. Orpheus, from the Greek mythology Orpheus and Eurydice, is also often associated with Scorpio. Greco-Roman gods such as Ares/Mars are also referred to Scorpio.
In the first, the legendary Greek hunter Orion and the Goddess Artemis held a competition to test their humting prowess. This came as a result of Orion's boast that he could single-handedly kill every animal on Earth. Artemis used her deadly Scorpion to prove him wrong. As thanks, Artemis (or Zeus in some legends) turned the scorpion into a constellation. In another version, Apollo orders the Scorpion to kill Orion as a result of Artemis' growing affection for the Hunter. Artemis hangs her lost lover's image in the night sky.
The third variation is that Gaia ordered the Scorpion to kill Orion as a result of his hunting. Being the Ancient Goddess who personified Earth and everything natural on it she may have had a problem with Orion's over-hunting. Interestingly enough, Orion and Scorpio are on opposite sides of the night sky so when Scorpio rises, Orion scurries away from his attacker.