The Hundreds of Cheshire, as with other Hundreds in England were the geographic divisions of Cheshire for administrative, military and judicial purposes. They were introduced in Cheshire some time before the Norman conquest. Later on, both the number and names of the hundreds changed by processes of land being lost from Cheshire, and merging or amalgamation of remaining hundreds. The Ancient parishes of Cheshire were usually wholly within a specific hundred, although a few were divided between two hundreds.
Cheshire, in the Domesday Book was recorded as a larger county than it is today. There is a small disagreement in published sources about where the northern boundary of Cheshire lay, and some parts of the border areas with Wales were disputed with the predecessors of Wales. One source states that the northern border was the River Ribble, resulting in large parts of what was to become Lancashire being at that time part of Cheshire. This area is included as "Inter Ripam et Mersam" in the Domesday Book. However, more recent sources confirm that the actual boundary at that time was the River Mersey.
The land south of the River Mersey was made up of twelve hundreds: Atiscross, Bochelau, Chester, Dudestan, Exestan, Hamestan, Middlewich, Riseton, Roelau, Tunendune, Warmundestrou and Wilaveston, with the hundreds of Atiscross and Exestan being disputed with the Kingdom of Gwynedd. (There are slight variations between various sources in the spellings of these names.) The hundreds in between the Mersey and the Ribble (Inter Ripam et Mersam) were: West Derby ("Derbei"), Newton ("Neweton"), Warrington ("Walingtune"), Blackburn ("Blacheburn") and Leyland ("Lailand").