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In page Lancashire:

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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. In the centuries after the Roman withdrawal in 410 AD the northern parts of the county probably formed part of the Brythonic kingdom of Rheged[citation needed], a successor entity to the Brigantes tribe[citation needed]. During the mid-8th century, the area was incorporated into the Anglo-Saxon Kingdom of Northumbria from the north of the River Ribble and the Kingdom of Mercia from the south, which both became parts of England in the 10th century.