It presumably encompassed the legendary and mythical history of Iran from the beginning of time until the Sasanian period.
[3] Scholars have tried to determine the content of the Khwaday-Namag through a comparison of Zoroastrian works, Arabic sources, and Ferdowsi's Shahnameh.
Early Muslim authors must have used translations of the various Khwaday-Namags and other independent epic stories when writing about pre-Islamic Iranian history.
[4] Regarding the composition of the Khwaday-Namag, A. Shapour Shahbazi writes that its Sasanian compilers "mingled the memory of recent history with remote past and hoary legends" and did not draw from documentary sources like the Middle Persian inscriptions of the Sasanian kings.
[8] The main source of Ferdowsi's Shahnameh was the Shahnameh of Abu Mansur, a New Persian prose text made in 957 by a number of Zoroastrian scholars and dihqans under the supervision of Abu Mansur Mamari; only the introduction of this work remains today.