Sumerian in Cuneiform Decipherment

Inscription was made by king dariusm five 22, four 86 b c in eastern iran. And it details a victory made by kings old persian, babylonian and elemite which are all relatives of the ancient sumerian text and language. So we got to the task of deciphering each of those three cune form scripts. When we deciphered those, then we were able to go back in time and basicly reverse engineer babylonian, acadian and then sumerian. It was all due to the beh on inscription right there, that we could finally read sumerian in.