Plymouth is a city on the south coast of Devon, England, about south-west of Exeter and west-south-west of London, between the mouths of the rivers Plym to the east and Tamar to the west where they join Plymouth Sound to form the boundary with Cornwall. Plymouths early history extends to the Bronze Age, when a first settlement emerged at Mount Batten. This settlement continued as a trading post for the Roman Empire, until it was surpassed by the more prosperous village of Sutton founded in the ninth century, now called Plymouth. In 1620, the Pilgrim Fathers departed Plymouth for the New World and established Plymouth Colony – the second English settlement in what is now the United States of America. During the English Civil War the town was held by the Parliamentarians and was besieged between 1642 and 1646. Throughout the Industrial Revolution, Plymouth grew as a commercial shipping port, handling imports and passengers from the Americas, and exporting local minerals while the neighbouring town of Devonport became a strategic Royal Naval shipbuilding and dockyard town. In 1914 three neighbouring independent towns, viz., the county borough of Plymouth, the county borough of Devonport, and the urban district of East Stonehouse were merged to form a single County Borough. The combined town took the name of Plymouth which, in 1928, achieved city status. The citys naval importance later led to its targeting and partial destruction during World War II, an act known as the Plymouth Blitz. After the war the city centre was completely rebuilt and subsequent expansion led to the incorporation of Plympton and Plymstock along with other outlying suburbs in 1967. The city is home to people, making it the 30th-most populous built-up area in the United Kingdom and the second-largest city in the South West, after Bristol. It is governed locally by Plymouth City Council and is represented nationally by three MPs. Plymouths economy remains strongly influenced by shipbuilding and seafaring including ferry links to Brittany and Spain, but has tended toward a service-based economy since the 1990s. It has the largest operational naval base in Western Europe – HMNB Devonport and is home to Plymouth University.