Muam is first mentioned in the tale, "Aesma and the Red Eyed King."
Once, the old god Muam was discontent with the angle of the sun upon his mountain lean-to. To this end, he made an arduous journey to the end of the universe, where he found one of the ancient trees that held up its corners, and stripped one of its branches into a mighty pole two and a half billion leagues long. He trudged all the way from the edge back to the center, where he thrust the pole deep into the earth, and using it as an axle, turned the world by five degrees, and was content.