Analysis of information sources in references of the Wikipedia article "City of London" in English language version.
Of course until relatively recent times the name London referred only to the City of London with even Westminster remaining a separate entity. But when the County of London was created in 1888, the name often came to be rather loosely used for this much larger area, which was also sometimes referred to as Greater London from about this date. However, in 1965 Greater London was newly defined as a much enlarged area.