Theodosius the Great, also known as Theodosius I, was a Roman emperor who ruled from 379 AD until his death in 395 AD. He was known for his strict implementation of Christianity as the official religion of the empire and his efforts to quell various barbarian uprisings. Synonyms for Theodosius the Great include Theodosius I the Emperor, Theodosius Magnus, and Theodosius the Terrible. He is also sometimes referred to as Theodosius the Saint due to his strong devotion to Christianity and his efforts to stamp out paganism throughout the empire. His reign is still studied by historians and scholars today for its impact on the development of the Roman Empire.