In 1182, the land north of the Mersey became administered as part of the new county of Lancashire, thus resolving any uncertainty about the county in which the land "Inter Ripam et Mersam" was. Over the years, the ten hundreds consolidated and changed names to leave just seven—Broxton, Bucklow, Eddisbury, Macclesfield, Nantwich, Northwich and Wirral. In 1397 the county had lands in the march of Wales added to its territory, and was promoted to the rank of principality. This was because of the support the men of the county had given to King Richard II, in particular by his standing armed force of about 500 men called the "Cheshire Guard". As a result, the King's title was changed to "King of England and France, Lord of Ireland, and Prince of Chester". No other English county has been honoured in this way, although it lost the distinction on Richard's fall in 1399. Through the Local Government Act 1972, which came into effect on 1 April 1974, some areas in the north became part of the metropolitan counties of Greater Manchester and Merseyside. Stockport (previously a county borough), Altrincham, Hyde, Dukinfield and Stalybridge in the north-east became part of Greater Manchester. Much of the Wirral Peninsula in the north-west, including the county boroughs of Birkenhead and Wallasey, joined Merseyside as the Metropolitan Borough of Wirral. At the same time the Tintwistle Rural District was transferred to Derbyshire. The area of south Lancashire not included within either the Merseyside or Greater Manchester counties, including Widnes and the county borough of Warrington, was added to the new non-metropolitan county of Cheshire. Halton and Warrington became unitary authorities independent of Cheshire County Council on 1 April 1998, but remain part of Cheshire for ceremonial purposes and also for fire and policing. A referendum for a further local government reform connected with an elected regional assembly was planned for 2004, but was abandoned. As part of the local government restructuring in April 2009, Cheshire County Council and the Cheshire districts were abolished and replaced by two new unitary authorities, Cheshire East and Cheshire West and Chester. The existing unitary authorities of Halton and Warrington were not affected by the change. Prehistoric burial grounds have been discovered at The Bridestones near Congleton (Neolithic) and Robin Hood's Tump near Alpraham (Bronze Age).