Winchester is a city, county town of Hampshire. The city lies at the heart of the wider City of Winchester, a local government district, and is located at the western end of the South Downs National Park, along the course of the River Itchen. It is situated 68 miles (109 km) south-west of London and 13.6 miles (21.9 km) from Southampton, its other closest city. At the time of the 2001 Census, Winchester had a population of 41,420.Winchester developed from the Roman town of Venta Belgarum, which developed from an Iron Age oppidum. Winchester's major landmark is Winchester Cathedral, one of the largest cathedrals in Europe, with the distinction of having the longest nave and overall length of all Gothic cathedrals in Europe. The city is also home to the University of Winchester and Winchester College, the oldest public school in the United Kingdom. The city's architectural and historic interest, and its fast links to other towns and cities have led Winchester to become one of the most expensive and desirable areas of the country. A person who is from or resides in Winchester is sometimes locally known as a Wintonian. Its Old English name was Wintan-ceastre.