Engraved stone found in Havor, Gotland

Arvakr and Alsviðr (Árvak and Alsvin), Early-Awake and Very-Swift

In Norse mythology, Sköll (Old Norse “Treachery”) is a wolf that chases the horses Árvakr and Alsviðr, that drag the chariot which contains the sun (Sól) through the sky every day, trying to eat her. Sköll has a brother, Hati, who chases Máni, the moon. At Ragnarök, both Sköll and Hati will succeed in their quests.