Chihrdad
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The Čihrdād nask or Kitradād nask is one of the lost nasks (volumes) of the Sasanian Avesta and survives only as summaries preserved in later Zoroastrian writings. The text is said to have been a history of mankind from the beginning down to the revelation of Zarathustra, and it was an important source for later works like the Šāhnāmeh of Ferdowsi.