Drachm - Wahram II

Wahram II ruled for seventeen years but spent much of that reign managing simultaneous crises: a usurpation by his brother Hormizd in the east, Roman pressure under Carus — whose campaign in 283 AD reached Ctesiphon itself — and persistent Kushano-Sasanian instability along the northeastern frontier. That Carus died under mysterious circumstances near the Sasanian capital, and Rome promptly withdrew, likely saved the dynasty from a genuinely existential threat.

The references here — Göbl and the SNS Iran corpus — place this squarely among the earliest systematized Sasanian silver issues, before regional mint differentiation became pronounced.