The Roman Eastern Frontier And The Persian Wars... Link

Neither empire could maintain long-term conquests due to difficult terrain, including vast deserts and the Armenian mountains.

A video overview of the geopolitical factors behind the rivalry. The Roman Eastern Frontier and the Persian Wars...

The final major clash; Emperor Heraclius decisively defeated the Sasanians, ending the 700-year struggle. Strategy and Geography Neither empire could maintain long-term conquests due to