Adam Oehlenschläger,
The Gods of the North: an epic poem
“ ALF, plural ALFER, are inferior elementary divinities, divided into two classes, viz. the white Alfer, or Alfs of light; and the black Alfer, or Alfs of darkness. The white Alfer are related to the Asar and Vaner, and are friendly to mankind; they dwell with Balder in his palace of Breidablik. The black Alfer are mischievously disposed: they are connected with the Dvergar (dwarfs) , and like them they shun the light of day: they dwell in caverns and sally out at night only. Our word elf is derived therefrom. ”
