Hampshire tribes of northeastern Gaul - whether these two events are linked to the decline of hillforts is unknown. By the Roman conquest, the "oppidum" at Venta Belgarum, modern-day Winchester, was the "de facto" regional administrative centre; Winchester was, however, of secondary importance to the Roman-style town of Calleva Atrebatum, modern Silchester, built further north by a dominant Belgic polity known as the Atrebates in the 50s BCE. Julius Caesar invaded southeastern England briefly in 55 and again in 54 BCE, but he never reached Hampshire. Notable sites from this period include Hengistbury Head (now in Dorset), which was a major
New England town concept. Districts have not been at all common since the first half of the 19th century, and there have not been any districts anywhere in New England in over a century. Maine is the only New England state that currently has a significant amount of territory that is not sufficiently populated to support town governments, thus the only New England state that still has a need for the plantation type of municipality. For a historical example in New Hampshire, see Plantation number four. Perhaps because the towns themselves are such strong entities, most areas of New England never developed municipal