The Roman theatre had multiple functions; it was used as a recreational, educational, religious and civilizational building. It formed the Roman mind and conscience and was used as a form of political propaganda for the emperors and the elites throughout the empire. Roman theatres were built in all areas of the Empire. Rome's power and wealth gave them the ability to influence local architecture, such as all theatres throughout North Africa, with uniquely Roman attributes. This paper discusses the most important Roman innovations in theatre architecture in the Tripolitania region through a comparative study between the Leptis Magna and Sabratah Theatres.