Greece under the Roman Empire, from 31 BC to 180 AD is described as the era of the Pax Romana, a Roman Peace between Rome and the central areas of the Empire, like Greece and the Greek East. This period is described as a period of peace and security which permitted economical and cultural progress, especially in the cities such as Athens, Corinth, Alexandria, Miletus, Thessaloniki, and Smyrna. Due to a decentralized Roman provincial administration, the urban Greek elite re-appeared, which also had the right to participate in the Roman Senate. The Romans welcomed the Greek culture and Latin and Greek became the official languages of the Empire. A Greco-Roman Empire was created.