The City of London is a city, ceremonial county, and local government district located in England. Established by the Romans around 47 AD as Londinium, it serves as the historic center of the larger London metropolis. It is geographically surrounded by the modern ceremonial county of Greater London.
The City functions as a unique local authority area governed by the City of London Corporation, which is led by the Lord Mayor of London. While it is part of the region governed by the Greater London Authority, the City of London Corporation shares local government powers in the region with the councils of 32 other London boroughs.