In Norse mythology, Nótt (Old Norse “night” ) is night personified. In both the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson, Nótt is listed as the daughter of a figure by the name of Nörvi (with variant spellings) and is associated with the horse Hrímfaxi, while the Prose Edda features information about Nótt’s ancestry, including her three marriages. Nótt’s third marriage was with the god Dellingr and this resulted in their son Dagr, the personified day. As a proper noun, the word nótt appears throughout Old Norse literature.
Painting by Peter Nicolai Arbo (1831–1892), Nótt riding Hrímfaxi