Thor Odinson

Thor is the blood-son of Odin, All-Father of the Asgardians, and Jord, who was also known as Gaea, the goddess who was one of the Elder Gods. Odin sought to father a son whose power would derive from both Asgard and Midgard (as the Earth realm is called by Asgardians), and hence he sought to mate with Jord. Odin created a cave in Norway where Jord gave birth to Thor. Months after the infant Thor was weaned, Odin brought him to Asgard to be raised. Odin's wife, the goddess Frigga, acted as Thor's mother from that time onward. Not until many decades later did Thor learn that Jord was his birth mother.

Ragnarok Cycle
The Ragnarok cycle created numerous versions of Thor's origin story, and the fact that Asgard was a place of myth did not help matters when trying to keep track of all of the different stories and personalized descriptions of events. One such story came from the severed eye of Odin, which grew to great size, achieved sentience, and told Thor of another Thor who had existed before the current Thor's birth. This previous Thor was also the son of Odin, but had red hair, not blond hair like the current Thor. Thor was said in myth to have killed the Midgard Serpent, and to have been killed himself by the dying monster's venom, at Ragnarok, the destruction of a previous version of Asgard. Odin himself was killed, but a new Odin appeared in the place of several gods who survived Ragnarok, and it was this new Odin who fathered the current version of Thor. It is uncertain whether a true picture of Thor's origin will ever be told.

Early Life
The young Thor was raised alongside Loki, who had been adopted by Odin after Loki's Frost Giant father Laufey had been killed in battle. For all of their childhood, Loki was jealous of Thor. Loki's jealousy, which grew to hatred, resulted in a desire to kill Thor. Thus began Loki's enmity for Thor, which persisted for many centuries