The book of Isaiah is Narrative History, Prophetic Oracle, and even a Parable (chapter 5). The prophet Isaiah wrote it at approximately 700 B. C. (Chapters 40-66, written later in his life approx. 681 B. C. ). Isaiah is the first book in the section called Major Prophets. They are called Major Prophets because of the large amount of material they wrote not because their message was more important than any other prophet’s was.