The City of London is a geographically small city within Greater London. It is the historic core of London around which, along with Southwark and then Westminster, the modern conurbation grew. The City's boundaries have remained almost constant since the Middle Ages, and hence it is now only a tiny part of the much larger London metropolis. It is often referred to as "The City" or "The Square Mile" as it is just over one square mile in area.

Historically the centre of commerce and trade for the whole country it remains the financial centre of London, of the UK and arguably of Europe. It is the traditional headquarters of financial services companies.
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