The Emperors of Rome were the rulers of the Roman Empire, which began with Augustus in 27 BCE and lasted until the fall of the Western Roman Empire in 476 CE. These emperors held significant power, overseeing military, political, and economic aspects of the empire. Their reigns varied in length and effectiveness, with some, like Nero and Caligula, known for their controversial and often tyrannical rule. The role of the emperor evolved over time, with the title becoming synonymous with absolute authority. The Pax Romana, a period of relative peace and stability, was largely maintained by strong emperors. Notable emperors include Trajan, who expanded the empire to its greatest territorial extent, and Constantine, who embraced Christianity and established Constantinople as a new capital.