The City of London "is a city within London. The City constituted most of London from its settlement by the Romans in the 1st century AD to the Middle Ages, but the conurbation has since grown far beyond its borders. As the City's boundaries have remained almost unchanged since the Middle Ages, it is now only a tiny part of the metropolis of Greater London, though it remains a notable part of central London. It holds city status in its own right and is also a separate ceremonial county.
It is widely referred to as the City (often written on maps as "City" and differentiated from the phrase "the city of London" by capitalising the word City) or the Square Mile as it is 1.12 sq mi (2.90 km2) in area. These terms are also often used as metonyms for the United Kingdom's financial services industry, which continues a notable history of being largely based in the City. "
- The City of London + TRANSCRIPT + ACTIVITIES
"Everyone knows Big Ben, Buckingham Palace and Tower Bridge, but what else is there to the City of London? Learn about London's past, present and future in this video."