(Avestan: Vistaspa) and the king's subsequent conversion; the vision of Zoroaster. The life of Zoroaster from Vistasp's conversion up to Zoroaster's death, including his revelations on science and medicine. The miracles that followed Zoroaster's death The history of Persia until the Islamic conquest, with an emphasis on several historical or legendary figures. Prophecies and predictions up to the end of the millennium of Zoroaster (that ends one thousand years after his birth), including the coming of the first savior and his son Ushetar. The miracles of the thousand years of Ushetar until the coming of Ushetarmah. The miracles of the thousand years of Ushetarmah until the coming of the Saoshyant. The miracles of the fifty-seven years of the Saoshyant until the frashgird, the final renovation of the world. Book 8 Book 8 is a commentary on the various texts of the Avesta, or rather, on the Sassanid archetype of the Avesta. Book 8 is of particular interest to scholars of Zoroastrianism because portions of the canon have been lost and the Denkard at least makes it possible to determine which portions are missing and what those portions might have contained. The Denkard also includes an enumeration of the divisions of the Avesta, and which once served as the basis for a speculation that only one quarter of the texts had survived. In the 20th century it was determined that the Denkard's divisions also took Sassanid-era translations and commentaries into account; these were however not considered to be a part of the Avesta. Book 9 Book 9 is a commentary on the Gathic prayers of Yasna 27 and Yasna 54. Together, these make up Zoroastrianism's four most sacred invocations: the ahuna vairya (Y 27.13), the Ashem Vohu (Y 27.14), the yenghe hatam (Y 27.15) and the airyaman ishya (Y 54.1). Bibliography Further reading The Dēnkard in English Kassock, Zeke, (2012), Facsimile Of The Complete Text Of The Pahlavi Dinkard: Volume I: Books III - V, Zoroastrian texts