http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
history of Rome from 753 B. C. to A. D. 410
It was initially ruled by kings, but the Roman Republic was established in 509 BC. During the 5th century BC, Rome gained regional dominance in Latium, and eventually the entire Italian peninsula by the 3rd century BC. The population of the city at this point is estimated at about 310,000 people.