Manchester is a city and metropolitan borough in Greater Manchester, England, with a population of 545,500 as of 2017. It lies within the United Kingdom's third-most populous metropolitan area, with a population of 3.2 million. Manchester is fringed by the Cheshire Plain to the south, the Pennines to the north and east, and an arc of towns with which it forms a continuous conurbation. The local authority is Manchester City Council.
The recorded history of Manchester began with the civilian settlement associated with the Roman fort of Mamucium or Mancunium, which was established in about AD 79 on a sandstone bluff near the confluence of the rivers Medlock and Irwell. It was historically a part of Lancashire, although areas of Cheshire south of the River Mersey were incorporated in the 20th century. The first to be included, Wythenshawe, was added to the city in 1931. Throughout the Middle Ages Manchester remained a manorial township but began to expand "at an astonishing rate" around the turn of the 19th century. Manchester's unplanned urbanisation was brought on by a boom in textile manufacture during the Industrial Revolution and resulted in it becoming the world's first industrialised city.