The term 'Icelandic Poetry Book' refers to the Edda, a collection of Old Norse poems and stories from Iceland. It is believed to have been written in the 13th century and is one of the most important sources for understanding Norse mythology and Germanic heroic legends. The Edda consists of two parts: the Poetic Edda and the Prose Edda. The Poetic Edda contains a collection of mythological and heroic poems, while the Prose Edda is a handbook of poetics for skaldic poetry.