Heimdall (Old Norse Heimdallr, the prefix Heim- means home, the affix -dallr is of uncertain origin) one of the gods in Norse mythology. He is the guardian of the gods and of the link between Midgard and Asgard, the Bifrost Bridge. He will sound the Gjallarhorn, alerting the Aesir to the onset of Ragnarok where the world ends and is reborn. Illustration in The Olafur Brynjulfsson Edda, a manuscript which contains material from both the Younger and Elder Edda.