Flateyjarbók is an important medieval Icelandic manuscript. It is also known as GkS 1005 fol. and by the Latin name Codex Flateyensis. It was commissioned by Jón Hákonarson and produced by the priests and scribes Jón Þórðarson and Magnús Þórhallsson.

Heimskringla is the best known of the Old Norse kings' sagas. It was written in Old Norse in Iceland by the poet and historian Snorri Sturluson (1178/79–1241) c. 1230. The title Heimskringla was first used in the 17th century, derived from the first two words of one of the manuscripts.