How important was Zoroastrianism in the development of the Sasanian
Empire? (Coinage, texts, etc. could be used). If Zoroastrianism was
important, how was it used by the empire in terms of propaganda?
(Defense against Christianity?). How did adopting Zoroastrianism by the
Sasanians impact their relations with the Eastern Roman Empire? (Wars
of Shapur II and Khosrow II in the 4 th and 7 th CE).