→ Main article: History of London
Ancient
The existence of a pre-Roman settlement of the Celts in the area of the City of London could not be proven. Probably in 47 AD the Romans founded the city of Londinium. In 60 or 61 AD the Icenians, led by Queen Boudicca, destroyed the settlement. Londinium was rebuilt and replaced Camulodunum (Colchester) as the capital of Britain in the early 2nd century. From 197 AD Londinium was the capital of the province Britannia superior, and from about 300 AD of the province Maxima Caesariensis. Wall fortifications were built around the city.
In 410 AD the Romans withdrew their legions and the population was increasingly defenceless against raids by Germanic tribes. After the conquest of England by the Angles and Saxons, Londinium deteriorated into an uninhabited collection of ruins by the end of the 5th century.
Medieval
The Anglo-Saxons initially avoided the immediate vicinity of the destroyed town. In the later 7th century they founded the settlement of Lundenwic to the west of it, which belonged first to the kingdom of Mercia and later to the kingdom of Essex. Under the leadership of Alfred the Great, King of Wessex, the Anglo-Saxons recaptured the area at the mouth of the Thames from the Danes in 878. In the following years, the area was re-settled within the Roman city walls. The newly formed town was called Lundenburgh.
In 1066 the Normans conquered England and London replaced Winchester as the capital. The new ruler William I confirmed the special rights of London. Richard the Lionheart appointed the first Lord Mayor (mayor) in 1189, who was then elected by the increasingly powerful merchant guilds themselves from 1215. In 1209, the first bridge built of stone, the London Bridge, was completed, which was the only bridge in the city centre today until 1750. Several times London had to endure plundering by rebellious peasant armies, for example in 1381 during the Peasants' Revolt and in 1450 during the Jack Cade Rebellion.
In the War of the Roses, which ended in 1485 with the coronation of Henry Tudor as Henry VII, the city held to the Yorks' party. The Reformation broke the power of the church, which until then held about half the land; the redistribution of ecclesiastical estates from 1535 ushered in an era of economic growth and London rose to become a leading trading city.
early modern period
London had to endure some setbacks in its eventful history. After the establishment of the first large trading companies and the Royal Exchange had driven the economic rise in the 16th century, the city was hit by the "Great Plague" in 1664 and 1665, which claimed over 70,000 lives. In September 1666, the "Great Fire of London" devastated large parts of the city. About 13,000 houses and 89 churches fell victim to the flames.
The city was rebuilt after the devastating fire. Plans for a fundamental redesign failed, however, because the costs were too high, so the new houses were essentially built along the old winding streets. The architect Christopher Wren was responsible for the rebuilding. As a result, almost all the aristocratic residents left the old city centre for good and had new representative houses built in the up-and-coming West End. The poorest sections of the population, who had to make a living in the expanding port, were forced into the East End. At the end of the 17th century, London rose to become the most important financial centre in the world.
During the 18th century, London grew beyond its historic boundaries. New bridges across the Thames allowed the city to expand southward. In June 1780, London was the scene of the Gordon Riots, when fanatical Protestants opposed equal rights for Catholics.
Modern
In the course of the 19th century, the population multiplied, the construction of numerous suburban railways and subways allowed a rapid expansion of the built-over area. London gained great importance as the capital of the British Empire during the Victorian era. In 1851, according to the census, London was the largest city in Europe with a population of 2,651,939 and the center of the industrialized world. The first World's Fair, the "Great Exhibition", took place here in the same year.
The sprawling metropolitan area was fragmented into numerous parishes and judicial districts. The Metropolitan Police was founded in 1829 as the first special-purpose association, which subsequently took over the fight against crime throughout the metropolis, which had previously been carried out on a private basis. In 1855, unification in the field of building followed with the Metropolitan Board of Works. The London sewerage system, constructed under the direction of Joseph Bazalgette, is considered the largest building project of the entire 19th century. In 1889, with the County of London, a uniform administrative region was created for the entire conurbation for the first time ever.
The first half of the 20th century was marked by the expansion of the built-up area on a scale never before seen. The new suburbs were almost entirely outside the County of London: throughout Middlesex, west of Essex, north of Surrey, north-west of Kent and south of Hertfordshire.
During the Second World War, especially in 1940/41, London suffered severe destruction, particularly in the eastern industrial areas, due to attacks by the German Luftwaffe. These bombings went down in the history of the city with the name "The Blitz". A second wave of attacks followed in 1944/45 as part of Unternehmen Steinbock and with the V1 and V2 rockets. Almost 30,000 inhabitants died, hundreds of thousands were left homeless.
After the end of the war, the population dropped considerably as many Londoners settled in new satellite towns. In 1965, the Greater London administrative region was created, including the suburbs that had been created in the 20th century. Meanwhile, London lost its role as a major port, the facilities in the Docklands crumbled.
In 1981, an extensive urban development programme began, tens of thousands of service industry jobs were relocated from the City of London to the Isle of Dogs or newly created. A sprawling high-rise complex was built in Canary Wharf. The population rose again from its low point in the 1980s. In the years that followed, London consolidated its position as one of the world's most important cities for the global financial industry.
Several dozen people were killed in Islamist terrorist attacks on 7 July 2005. As a result, urban security measures were expanded. In 2011, the population rose to over 8 million, reaching a new high. In 2012, the Olympic Games were held in London.
In 2020, London was the city with the third most surveillance cameras per capita in the world.