Drachm - Yazdgard I

Yazdgard I ruled for over two decades and broke sharply from his predecessors by adopting a policy of religious tolerance that extended to Christians, Jews, and Manichaeans — so markedly that the Armenian church called him "the Sinner" while Roman sources praised him as an ally. His reign coincided with the Treaty of 363 and its aftermath, a period in which Sasanian-Roman relations were unusually stable, allowing trade and silver to flow more freely than the frontier wars of his father Shapur II had permitted.

The SNS Ib1/1a variety distinction hinges on die-link details in the reverse fire altar attendant positioning — minor enough that examples regularly circulate between classifications in major collections.