Following a prolonged struggle from ( 353 - 358 ) the Xionites were forced to conclude a peace .
Xionites ' king , Grumbates , accompanied Shapur II in the war against the Romans .
Following a prolonged struggle from ( 353 - 358 ) the Xionites were forced to conclude a peace , and their king , Grumbates , accompanied Shapur II in the war against the Romans .