In Norse mythology, Fenrir (Old Norse: “he who dwells in the marshes”), also known as Fenrisúlfr (Old Norse: “Fenrir's wolf”), or Vanargand ("Monster of the River Van"), is a giant, monstrous wolf, son of Loki and the giantess Angrboða, and the brother of Hel and Jörmungandr.
Fenrir was tied up by the gods but was destined to break free from his bonds and devour Odin during Ragnarök, after which he is killed by Odin's son, Víðarr.