Peterborough ( ) is a cathedral city in the City of Peterborough district of Cambridgeshire, England. It was formerly governed as part of Northamptonshire and briefly Peterborough and Huntingdonshire. The city is north of London, on the River Nene which flows into the North Sea to the north-east. The local topography is flat, and in some places, the land lies below sea level, for example in parts of the Fens to the east and to the south of Peterborough. Human settlement in the area began before the Bronze Age, as can be seen at the Flag Fen archaeological site to the east of the current city centre, also with evidence of Roman occupation. The Anglo-Saxon period saw the establishment of a monastery, Medeshamstede, which later became Peterborough Cathedral. In 2020 the built-up area subdivision had an estimated population of 179,349. In 2021 the Unitary Authority area had a population of 215,671. The population grew rapidly after the railways along with industry, the town became known for brick manufacture, arrived in the 19th century. After the Second World War, industrial employment fell and growth was limited until its designation as a New Town in the 1960s. The town's main economic sectors are financial services and distribution. Toponym The original name of the town was Medeshamstede. The town's name changed to Burgh from the late tenth century, possibly after Abbot Kenulf had built a defensive wall around the abbey which was dedicated to Saint Peter; eventually this developed into the form Peterborough. In the 12th century, the town was also known as Gildenburgh, which is found in the Peterborough version of the Anglo-Saxon Chronicle (see Peterborough Chronicle below) and a history of the abbey by the monk Hugh Candidus. The town does not appear to have been a borough until at least the 12th century. History Early history Peterborough and its surrounding areas around have been inhabited for thousands of years because it is where permanently drained land in The Fens is created by the River Nene. Remains of Iron Age settlement and what is thought to be religious activity can be seen at the Flag Fen archaeological site to the east of the city centre. The Romans established a fortified garrison town at Durobrivae on Ermine Street, to the west in Water Newton, around the middle of the 1st century AD. Durobrivae's earliest appearance among surviving records is in the Antonine