In Roman legend, Draco was a dragon killed by the goddess Minerva and tossed into the sky upon his defeat. In turn forming the constellation we know of today.
I also found this out today:
"Draco is the version of the dragon found in Graeco-Roman myths and traditions. Descriptions of the creature found in early classical writing suggest a kind of winged serpent rather then the more traditional shape of the dragon. Bestiaries of the 12th century described Draco as a great serpent with a crest on its head and a very small mouth. It had the ability to dazzle its victims with a bright light which shone everywhere on its body. A favorite trick of Draco was to lie in wait for unsuspecting travelers, suspended from the branches or wound around the trunk of a tree." -The Element Encyclopedia of Magical Creatures, pg. 175