Shapur I's inscription at Naqsh-e-Rostam describes the satrapy as "extending to the Caucasus mountains and the Gate of Albania (also known as Gate of the Alans)", but for the most part it was located south of the lower course of the rivers Kura and the Aras (Araxes), bordered on the south by Atropatene, and had the Caspian Sea on its east.
As Isfahan was a vital stop along the Silk Road, goods from all the civilized countries of the world, spanning from Portugal in the West, to the Middle Kingdom in the East, found its ways to the hands of gifted merchants, who knew how to make the best profits out of them.
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Donald Wilber gives the most plausible explanation to this; the vision of Shaykh Bahai was for the mosque to be visible wherever in the maydān a person was situated.
The first recorded use of the word zandik is probably on the inscription in Naqsh-e Rajab attributed to Kartir, high-priest and advisor of Sassanid emperors Hormizd I, Bahram I and Bahram II, in which it explicitly denotes Manichaeans as "the ones with corrupted faith".