Old Icelandic literature refers to the body of works written in Old Icelandic, a North Germanic language spoken in Iceland from the 9th to 13th centuries. The most famous work of Old Icelandic literature is the Poetic Edda, an anonymous collection of poems and stories from Norse mythology. It is believed to have been written in the 13th century, although some of the material may be older. The Prose Edda, written by Snorri Sturluson in the 13th century, is another important work of Old Icelandic literature. It is a manual for skaldic poetry, which was a form of verse used by Icelandic poets.