King Hiss

Had a Human like disguise, true form was an upper body comprised of five intertwined serpents
Ruler of the Snake Men, served the Unnamed One, formed an empire that spanned across the stars
Travelled to Eternia, had Snake Mountain constructed, fought a war of conquest across the planet;
Defeated by the Elders, sealed in a void beneath Snake Mountain
Freed centuries later, battled the Masters of the Universe & lost