London is the capital and largest city of both the United Kingdom and of England, and the largest city in western Europe. Situated on the River Thames in South-East England, Greater London has an official population of roughly 7.5 million people — although the figure of over 14 million for the city's total metropolitan area more accurately reflects London's size and importance. London is historically one of the great, "world cities," and remains a global capital of culture, fashion, finance, politics and trade.
The name London originally referred only to the once-walled "Square Mile" of the original Roman (and later medieval) city (confusingly called the "City of London" or just "The City"). Today, London has taken on a much larger meaning to include all of the vast central parts of the modern metropolis, with the city having absorbed numerous surrounding towns and villages over the centuries. The term Greater London embraces central London together with all the outlying suburbs that lie in one continuous urban sprawl within the lower Thames valley. Though densely populated by New World standards, London retains large swathes of green parkland and open space, even within the city centre.
Greater London consists of 32 London boroughs and the City of London that, together with the Mayor of London, form the basis for London's local government. The Mayor of London is elected by London residents and should not be confused with the Lord Mayor of the City of London. The names of several boroughs, such as Westminster or Camden, are well-known and self-explanatory, others less so, such as Hackney or Tower Hamlets. A traveller's London is better defined by recognized cultural, functional and social districts of varying type and size:
Settlement has existed on the site of London since well before Roman times, with evidence of Bronze Age and Celtic settlement. The Roman city of Londinium, established just after the Roman conquest of Britannia in the year 43, formed the basis for the modern city (some isolated Roman period remains are still to be seen within the City). After the end of Roman rule in 410 and a short-lived decline, London experienced a gradual revival under the Anglo-Saxons, as well as the Norsemen, and emerged as a great medieval trading city, and eventually replaced Winchester as the royal capital of England. This paramount status for London was confirmed when William the Conqueror, a Norman, built the Tower of London after the conquest in 1066 and was crowned King of England in Westminster.
London went from strength to strength and with the rise of England to first European then global prominence, the city became a great centre of culture, government and industry. London's long association with the theatre, for example, can be traced back to the English renaissance (witness the Rose Theatre [2] and great playwrights like Shakespeare who made London their home). With the rise of Britain to supreme maritime power in the 18th and 19th centuries and the possessor of the largest global empire, London became an imperial capital and drew people and influences from around the world to become, for many years, the largest city in the world.
England's royal family has, over the centuries, added much to the London scene for today's traveller: the Albert Memorial, Buckingham Palace, Kensington Palace, Royal Albert Hall, Tower of London and Westminster Abbey being prominent examples.