The origin of the name Ravenna is unclear, although it is believed the name is Etruscan. Some have speculated that "ravenna" is related to "Rasenna" (later "Rasna"), the term that the Etruscans used for themselves, but there is no agreement on this point.
Ancient era
The origins of Ravenna are uncertain. The first settlement is variously attributed to (and then has seen the co presence of) the Thessalians, the Etruscans and the Umbrians, afterwards its territory was settled also by the Senones, especially the southern countryside of the city (that wasn't part of the lagoon), the Ager Decimanus. Ravenna consisted of houses built on piles on a series of small islands in a marshy lagoon – a situation similar to Venice several centuries later. The Romans ignored it during their conquest of the Po River Delta, but later accepted it into the Roman Republic as a federated town in 89 BC. In 49 BC, it was the location where Julius Caesar gathered his forces before crossing the Rubicon. Later, after his battle against Mark Antony in 31 BC, Emperor Augustus founded the military harbor of Classe. This harbor, protected at first by its own walls, was an important station of the Roman Imperial Fleet. Nowadays the city is landlocked, but Ravenna remained an important seaport on the Adriatic until the early Middle Ages. During the German campaigns, Thusnelda, widow of Arminius, and Marbod, King of the Marcomanni, were confined at Ravenna.
Ravenna greatly prospered under Roman rule. Emperor Trajan built a 70 km (43.50 mi) long aqueduct at the beginning of the 2nd century. In AD 402, Emperor Honorius transferred the capital of the Western Roman Empire from Milan to Ravenna. The transfer was made partly for defensive purposes: Ravenna was surrounded by swamps and marshes, and was perceived to be easily defensible (although in fact the city fell to opposing forces numerous times in its history); it is also likely that the move to Ravenna was due to the
