London is the city region with the highest population in the United Kingdom. On the

LONDON
London is the capital of England and the United Kingdom. London is the city region with the highest population in the United Kingdom. On the Thames, London has been a central city since it was founded by the Romans two millennia ago as Londinium.
London's original city centre, the City of London is England's smallest city. In 2011 had 7,375 inhabitants on an area of 2.9 km².
The term "London" is also used for the urban region which developed around this city centre. This area forms the region of London, as well as the Greater London administrative unit, led by the Mayor of London and the London Assembly.
In modern times, London is one of the world's most important political, economic and cultural centres. London was the capital of the British Empire and so for almost three centuries the centre of power for large parts of the world.
The city has about 9.1 million inhabitants (2018). If one counts the entire metropolitan area of London (London Metropolitan Area), it has about 15 million people. The city is the largest in Europe by population. The climate is moderate.

History

The Romans built the city of Londinium along the River Thames in the year AD 43. The name Londinium (and later 'London') came from the Celtic language of the Ancient Britons. In the year AD 61, the city was attacked and destroyed. Then the Romans rebuilt the city, and London became an important trading hub.
After the decline of the Roman Empire, few people remained in London. This was partly because the Anglo-Saxon people of Sub-Roman Britain were primarily agricultural. Once the Romans had gone, trade with Continental Europe dwindled. In the 9th century, more people started living in London again. It became the largest city in England. However, it did not become the capital city of England again until the 12th century.
After the railways were built, London grew much larger. Greater London has 33 boroughs (neighbourhoods) and a mayor. The old City of London is only a square mile in size but has its own Lord Mayor.
Another famous old part of Greater London is Westminster, which was always a different city from the City of London. In Westminster is Westminster Abbey (a cathedral), The Palace of Westminster (the Houses of Parliament, with Big Ben), and 10 Downing Street (where the Prime Minister lives).