what was the population of ancient rome at its height
History of Rome At the peak of Roman imperial power in the 2nd century, the population of the city numbered about a million people[citation needed], a size that it never attained again until its becoming the capital of the Republic of Italy in 1946; close to three percent of the population of the empire lived within its limits. Following the Crisis of the Third Century and the transfer of the imperial capital to Constantinople in AD 330, Rome entered a period of gradual decline.