Norse Mythology: Considered the god of dawn, his name means "shining one". Snorri called him a member of the family of the gods. He was the third husband of Night (Nott), with whom he had a son called Dag (Day). In some of the lays there is mention of "Delling's door", possibly meaning dawn.
(Nicole Cherry, A list of Norse Beings, http://www.ugcs.caltech.edu/~cherryne)