Archeologists have found the oldest evidence of chemical warfare

[Lucio Domicio Aureliano]

I did not forget anything. If you can make such simpleton calculation on Roman longevity (And the transition between republic and empire), then the Partho-Sassanian episode lasted beyond 900 years and two additional centuries as the Caliphate had difficulties subduing Tabarîstân; an area which otherwise was comparable to the times when the Byzantines were severely crammed of space, during the mid-Thematic era and significantly during the dynasty of the Palaiologos.

Maybe you should add the despotate of Epirus too. Then maybe I should add the independent post-Achaemenid Iranian kingdoms of the early Hellenistic age.



It will be interesting to see what sorts of evidence you have to support this claim.

I don´t disregard the advances and culture brought by the sassanids but, for my thinking, the romans and the greeks did more. Let´s say the Partho-Sassanian episode lasted for one-thousand year yet it´s much less than the romans. Not to mention that the Graeco-Roman society are the backbone of hte western world. Anyway, i´m also aware of the fact that the romans considered the sassanids their equal.