London is the capital of England and the United Kingdom. A major settlement for two millennia, its history goes back to its founding by the Romans, who called it Londinium. Londons core, the ancient City of London, the "square mile", retains its mediaeval boundaries. Since at least the nineteenth century, the name "London" has also referred to the metropolis developed around it. Today, the bulk of this conurbation forms the London region and the Greater London administrative area, with its own elected mayor and assembly.