as not very different from the natural one (the word "paradise", or pairi.daeza, applies equally to both.) Manichaeism's basic doctrine was that the world and all corporeal bodies were constructed from the substance of Satan, an idea that is fundamentally at odds with the Zoroastrian notion of a world that was created by God and that is all good, and any corruption of it is an effect of the bad. Present-day Iran Many aspects of Zoroastrianism are present in the culture and mythologies of the peoples of Greater Iran, not least because Zoroastrianism was a dominant influence on the people of the cultural continent for a thousand years. Even after the rise of Islam and the loss of direct influence, Zoroastrianism remained part of the cultural heritage of the Iranian language-speaking world, in part as festivals and customs, but also because Ferdowsi incorporated a number of the figures and stories from the Avesta in his epic Shāhnāme, which is pivotal to Iranian identity. One notable example is the incorporation of the Yazata Sraosha as an angel venerated within Shia Islam in Iran. Religious text Avesta The Avesta is a collection of the central religious texts of Zoroastrianism written in the old Iranian dialect of Avestan. The history of the Avesta is speculated upon in many Pahlavi texts with varying degrees of authority, with the current version of the Avesta dating at oldest from the times of the Sasanian Empire. According to Middle Persian tradition, Ahura Mazda created the twenty-one Nasks of the original Avesta which Zoroaster brought to Vishtaspa. Here, two copies were created, one which was put in the house of archives and the other put in the Imperial treasury. During Alexander's conquest of Persia, the Avesta (written on 1200 ox-hides) was burned, and the scientific sections that the Greeks could use were dispersed among themselves. However, there is no strong evidence historically towards these claims and they remain contested despite affirmations from the Zoroastrian tradition, whether it be the Denkart, Tansar-nāma, Ardāy Wirāz Nāmag, Bundahsin, Zand i Wahman Yasn or the transmitted oral tradition. As tradition continues, under the reign of King Valax (identified with a Vologases of the Arsacid Dynasty), an attempt was made to restore what was considered the Avesta. During the Sassanid Empire, Ardeshir ordered Tansar, his high priest, to finish the work that King Valax had started. Shapur I sent priests to locate the