Middle English, earlier Ligraceaster, Ligera ceaster (early 10c.) "Roman Town of the People Called Ligore," a tribal name, perhaps "dwellers by the River Ligor." For second element, see Chester. The site is the Roman Ratae Coritanorum, fortified tribal capital of the Coritani, whose name is of unknown origin, with a Celtic word for "ramparts." The modern name "is best regarded as a new descriptive term for a deserted site" [Watts, "Cambridge Dictionary of English Place-Names"].
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