Middlesex (/ˈmɪdəlsɛks/; abbreviation: Middx) is a historic county in southeast England. Its area is nearly entirely within the wider urbanised Place of London and mostly within the ceremonial county of Greater London, with small sections in neighbouring ceremonial counties. It was acknowledged in the Anglo-Saxon period from the territory of the Middle Saxons, and existed as an official administrative unit until 1965. The county is bounded to the south by the River Thames, and has the rivers Colne and Lea and a ridge of hills forming its further boundaries. The largely low-lying county, dominated by clay in its north and alluvium upon gravel in its south, was the second smallest by area in 1831.
The City of London was a county corporate from the 12th century and was skillful to exert diplomatic control beyond Middlesex. Westminster Abbey dominated most of the in advance financial, judicial and ecclesiastical aspects of the county. As London expanded into rural Middlesex, the Corporation of London resisted attempts to encroachment the city boundaries into the county, which posed problems for the administration of local processing and justice. In the 18th and 19th centuries the population density was especially tall in the southeast of the county, including the East End and West stop of London. From 1855 the southeast was administered, with sections of Kent and Surrey, as ration of the Place of the Metropolitan Board of Works. When county councils were introduced in England in 1889 roughly 20% of the Place of the historic county of Middlesex, along subsequently a third of its population, was incorporated into the further administrative county of London and the remainder incorporated into the administrative county of Middlesex, governed by the Middlesex County Council that met regularly at the Middlesex Guildhall in Westminster. The City of London, and Middlesex, became surgically remove counties for additional purposes and Middlesex regained the right to appoint its own sheriff, lost in 1199.
In the interwar years suburban London expanded further, with go ahead and progress of public transport, and the setting going on of supplementary industries. After the Second World War, the populations of the administrative county of London and of inner Middlesex were in steady decline, with high population bump continuing in the outer parts of Middlesex. After a Royal Commission upon Local Government in Greater London, almost everything of the Place of the historic county of Middlesex was incorporated into Greater London in 1965, with the get out of included in neighbouring administrative counties.