Norfolk () is a ceremonial and non-metropolitan county in East Anglia in England. It borders Lincolnshire to the north-west, Cambridgeshire to the west and south-west, and Suffolk to the south. Its northern and eastern boundaries are the North Sea, with The Wash to the north-west. The county town is the city of Norwich. With an area of and a population of 859,400, Norfolk is a largely rural county with a population density of 401 per square mile (155 per km2). Of the county's population, 40% live in four major built up areas: Norwich (213,000), Great Yarmouth (63,000), King's Lynn (46,000) and Thetford (25,000). The Broads is a network of rivers and lakes in the east of the county, extending south into Suffolk. The area is protected by the Broads Authority and has similar status to a national park. History The area that was to become Norfolk was settled in pre-Roman times, (there were Palaeolithic settlers as early as 950,000 years ago) with camps along the higher land in the west, where flints could be quarried. A Brittonic tribe, the Iceni, emerged in the 1st century BC. The Iceni revolted against the Roman invasion in AD 47, and again in 60 led by Boudica. The crushing of the second rebellion opened the area to the Romans. During the Roman era roads and ports were constructed throughout the area and farming was widespread. Situated on the east coast, the homelands of the Iceni were vulnerable to attacks from continental Europe and other parts of Britain, and forts were built to defend against raids by the Saxons and the Picts. A period of depopulation, which may have been due to these threats, seems to have followed the departure of the Romans. Soon afterward, Germanic peoples from the North Sea area settled in the region. Though they became known as Angles, they were likely not affiliated to any tribe in particular at the time of their migration. It is thought that the settlement here was early (possibly beginning at the start of the fifth century, thereby preceding the alleged date of Hengist and Horsa's arrival in Kent) and that it occurred on a large scale. By the 5th century the Angles had established control of the region and later became the "north folk" and the "south folk"; hence "Norfolk" and "Suffolk". Norfolk, Suffolk and several adjacent areas became the kingdom of East Anglia (one