Cesare Augusto, also known as Caesar Augustus, was the first emperor of Rome who ruled from 27 BC until his death in AD 14. He played a crucial role in transforming the Roman Republic into the Roman Empire, marking a significant shift in political structure and cultural identity within Rome and its territories. Augustus' reign brought about a period of relative peace known as the Pax Romana, which had lasting impacts on language, culture, and identity in the Roman world.