Prose Edda was created in 1220.

Snorri Sturluson wrote Prose Edda.

The Prose Edda was written by Snorri Sturluson, an Icelandic scholar and historian, in the 13th century. It is a collection of Old Norse myths, poetic tales, and legends that provide insight into Norse mythology and cosmology.

Edda is a term that is commonly used when referring to the Old Norse Poetic Edda and the Prose Edda. These are literary works that can be dated bay to the 13th century in Iceland.

The story about Thor and the Midgard serpent can be found in the "Prose Edda" in the section called "Gylfaginning." This section focuses on the Norse creation myth and includes various stories about the gods, including Thor's encounters with the serpent.