Thor (comics)
Thor, a founding member of the superhero group the Avengers, often battles his evil adoptive brother Loki, a Marvel character adapted from the Norse god of mischief. He is among Marvel's most powerful superheroes. Many recurring characters in his stories are based on Norse Mythology. Apart from this main superhero, Marvel features a number of characters based on him.
Old Norse religion
Norse mythological sources, particularly Snorri and "Vǫluspá", differentiate between two groups of deities, the Æsir and the Vanir, who fought a war during which the Vanir broke down the walls of the Æsir's stronghold, Asgard, and eventually made peace by means of a truce and the exchange of hostages. Some mythographers have suggested that this myth was based on recollection of a conflict in Scandinavia between adherents of different belief systems; in Georges Dumézil's tripartite theory both the war and the division of the pantheon into two groups are related to Indo-European parallels, with the Vanir exemplifying the second "function", that of fertility and the cycle of life and death.