In 1887, John Bartholomew's Gazetteer of the British Isles described London like this:
London, the capital of England, and the principal town of the British Empire, on river Thames, mostly in Middlesex, but also occupying parts of Surrey, Kent, and Essex, 60 miles (by the river's course) from the sea at the Nore. ... The centre of the Government and commerce of the British Empire, London is the greatest city of any age or country. Politically, financially, and commercially, as well as on account of its immense size and population, its progress and pre-eminence form a very remarkable feature in the history of civilisation. Without entering upon the vague traditions which have survived from more obscure eras, we find that as early as A.D. 61 the Lundimum of the Romans was a place of importance; Colonia Augusta being another of its Roman designations.
For an overview of how the county has changed, please see our redistricted information for the modern of London -- but you should check this covers the area you are interested in.
GB Historical GIS / University of Portsmouth, History of London | Map and description for the county, A Vision of Britain through Time.
Date accessed: 10th December 2016
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "London".