Original: By place Roman Empire Roman Emperor Trajan completes his invasion of Parthia by capturing the cities of Seleucia, Babylon, Ctesiphon and Susa, marking the high-water mark of the Roman Empire's eastern expansion.
Simplified: Roman Emperor Trajan completes his invasion of Parthia by capturing the cities of Seleucia, Babylon, Ctesiphon and Susa, marking the high-water mark of the Roman Empire's eastern expansion.