Lotan
In Mesopotamian legend the Lotan is a seven head dragon and is the adversary is the god Baal, who finally kills it. Lotan represents the primordial chaos from which order is created. The Lotan is similar to Leviathan and Tiamat that surrounds the world.
John and Caitlin Matthews, The Element Encyclopaedia of Magical Creatures, 2013, Lotan, p 299