Some scholars have claimed that the Avestan alphabet was created under the reign of Khusrau I, but more likely it was earlier, possibly in the time of Shapur II. We have seen how Khusrau I destroyed the Mazdakites.
He also enforced a dualist Zoroastrian orthodoxy on his people, even forbidding religious controversies according to Mas'udl. It is safe to assume that the Zoroastrian orthodoxy which we know from the Pahlavl books of the ninth century and later became fixed during the reign of Khusrau.
One might continue to enumerate the achievements of the reign of Khusrau, such as the silver plates and engraved gems in various museum collections, all testimony to the wealth of his reign. The famous building Taq-i Kisra in Ctesiphon, part of which still stands, impresses everyone with the immense size of the central arch or aivdn.
The structure may date from the beginning of the Sasanian empire and it may have been extended or embellished under Khusrau I. Such matters are the subject for special investigation and can be mentioned here only as evidence of the pomp and glory of the reign of Khusrau "of immortal soul".