Gesta Hammaburgensis ecclesiae pontificum is a historical treatise written between 1073 and 1076 by Adam of Bremen, who made additions (scholia) to the text until his death . It is one of the most important sources of the medieval history of Northern Europe, and the oldest textual source reporting the discovery of coastal North America.

Old Norse religion, also known as Norse paganism, is a branch of Germanic religion which developed during the Proto-Norse period, when the North Germanic peoples separated into a distinct branch of the Germanic peoples. It was replaced by Christianity and forgotten during the Christianisation of Scandinavia. Scholars reconstruct aspects of North Germanic Religion by historical linguistics, archaeology, toponymy, and records left by North Germanic peoples, such as runic inscriptions in the Younger Futhark, a distinctly North Germanic extension of the runic alphabet. Numerous Old Norse works dated to the 13th-century record Norse mythology, a component of North Germanic religion.