History of Manchester
According to Oxford University Press, Manchester derived its name from Mamucium, the Roman name for the 1st century-settlement and fort. Mamucium itself is a Latinised form of the Celtic meaning "breast-shaped hill".
Greater Manchester
Although the modern county of Greater Manchester was not created until 1974, the history of its constituent settlements goes back centuries. There is evidence of Iron Age habitation, particularly at Mellor, and Celtic activity in a settlement named Chochion, believed to have been an area of Wigan settled by the Brigantes. Stretford was also part of the land believed to have been occupied by the Celtic Brigantes tribe, and lay on their border with the Cornovii on the southern side of the River Mersey. The remains of 1st-century forts at Castlefield in Manchester, and Castleshaw Roman fort in Saddleworth, are evidence of Roman occupation. Much of the region was omitted from the Domesday Book of 1086; Redhead states that this was because only a partial survey was taken, rather than sparsity of population.