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
La Venta of legitimizing power.” Frans Blom and Oliver La Farge made the first detailed descriptions of La Venta during their 1925 expedition, sponsored by Tulane University. Originally La Venta was thought to be a Mayan site. It wasn't until more sophisticated radiocarbon techniques were developed in the 1950s that Olmec sites were irrefutably dated as preceding the Maya. La Venta was first excavated by Matthew Stirling and Philip Drucker (assisted by Waldo Wedel in 1943, due to Drucker’s military service during WWII) between 1940 and 1943, resulting in several articles by Stirling and in 1952 a two-volume monograph by Drucker. Stirling