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The map features a street plan of the county town, Lancaster, and side panels containing portraits of kings from the House of Lancaster and the House of York. During Roman times the area was part of the Brigantes tribal area in the military zone of Roman Britain.
The towns of Manchester, Lancaster, Ribchester, Burrow, Elslack and Castleshaw grew around Roman forts.
The county boroughs also had many boundary extensions.
The borders around the Manchester area were particularly complicated, with narrow protrusions of the administrative county between the county boroughs – Lees urban district formed a detached part of the administrative county, between Oldham county borough and the West Riding of Yorkshire.
In the centuries after the Roman withdrawal in 410AD the northern parts of the county probably formed part of the Brythonic kingdom of Rheged, a successor entity to the Brigantes tribe.
During the mid-8th century, the area was incorporated into the Anglo-Saxon Kingdom of Northumbria, which became a part of England in the 10th century.
The history of Lancashire begins with its founding in the 12th century.The administrative county was also the most populous of its type outside London, with a population of 2,280,359 in 1961.On 1 April 1974, under the Local Government Act 1972, the administrative county was abolished, as were the county boroughs. In Greater Manchester the successor boroughs were Bury, Bolton, Manchester, Oldham (part), Rochdale, Salford, Tameside (part), Trafford (part) and Wigan.Lancashire rivers drain westwards from the Pennines into the Irish Sea.
Rivers in Lancashire include the Ribble, Wyre and Lune.By the 1830s, approximately 85% of all cotton manufactured worldwide was processed in Lancashire.