Londinium in the context of "London, England"

London is the capital and largest city of both England and the United Kingdom, with a population of 9.1 million people in 2024. Its wider metropolitan area is the largest in Western Europe, with a population of 15.1 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre, the City of London, was founded by the Romans as Londinium and has retained its medieval boundaries. The City of Westminster, to the west of the City of London, has been the centuries-long host of the national government and parliament. London grew rapidly in the 19th century, becoming the world's largest city at the time. Since the 19th century the name "London" has referred to the metropolis around the City of London, historically split between the counties of Middlesex, Essex, Surrey, Kent and Hertfordshire, which since 1965 has largely comprised the administrative area of Greater London, governed by 33 local authorities and the Greater London Authority.

As one of the world's major global cities, London exerts a strong influence on world art, entertainment, fashion, commerce, finance, education, healthcare, media, science, technology, tourism, transport and communications. London is Europe's largest city economy and one of the world's major financial centres. London hosts Europe's largest concentration of higher education institutions, comprising over 50 universities and colleges and enrolling more than 500,000 students as at 2023. It is home to several of the world's leading academic institutions: Imperial College London, internationally recognised for its excellence in natural and applied sciences, and University College London (UCL), a comprehensive research-intensive university, consistently rank among the top ten globally. Other notable institutions include King's College London (KCL), highly regarded in law, humanities and health sciences; the London School of Economics (LSE), globally prominent in social sciences and economics; and specialised institutions such as the Royal College of Art (RCA), Royal Academy of Music (RAM), the Royal Academy of Dramatic Art (RADA), the School of Oriental and African Studies (SOAS) and London Business School (LBS). It is the most-visited city in Europe and has the world's busiest city airport system. The London Underground is the world's oldest rapid transit system.

The City of London (often known as the City or the Square Mile) is a city, ceremonial county and local government district in England. Established by the Romans around 47 AD as Londinium, it forms the historic centre of the wider London metropolis. Surrounded by the modern ceremonial county of Greater London, from which it remains separate, the City is a unique local authority area governed by the City of London Corporation, which is led by the Lord Mayor of London; although it forms part of the region governed by the Greater London Authority.

Nicknamed the Square Mile, the City of London has an area of 1.12 sq mi (716.80 acres; 2.90 km), making it the smallest city in the United Kingdom. It had a population of 8,583 at the 2021 census, however over 500,000 people were employed in the area as of 2019.

The Roman conquest of Britain was the Roman Empire's conquest of most of the island of Britain, which was inhabited by the Celtic Britons. It began in earnest in AD 43 under Emperor Claudius, and was largely completed in the southern half of Britain (most of what is now called England and Wales) by AD 87, when the Stanegate was established. The conquered territory became the Roman province of Britannia.

Following Julius Caesar's invasions of Britain in 54 BC, some southern British chiefdoms had become allies of the Romans. The exile of their ally Verica gave the Romans a pretext for invasion. The Roman army was recruited in Italia, Hispania, and Gaul and used the newly-formed fleet Classis Britannica. Under their general Aulus Plautius, the Romans pushed inland from the southeast, defeating the Britons in the Battle of the Medway. By AD 47, the Romans held the lands southeast of the Fosse Way. British resistance was led by the chieftain Caratacus until his defeat in AD 50. The isle of Mona, a stronghold of the druids, was attacked in AD 60. This was interrupted by an uprising led by Boudica, in which the Britons destroyed Camulodunum, Verulamium and Londinium. The Romans put down the rebellion by AD 61.

51°30′45″N 00°07′21″W / 51.51250°N 0.12250°W / 51.51250; -0.12250

The Anglo-Saxon period of the history of London dates from the end of the Roman period in the 5th century to the beginning of the Norman period in 1066.

Britannia Inferior (Latin for "Lower Britain") was a new province carved out of Roman Britain probably around AD 197 during the reforms of Septimius Severus although the division may have occurred later, between 211 and 220, under Caracalla. The removal of the governors in Londinium from control over the legions guarding Hadrian's Wall was aimed at reducing their power, given Clodius Albinus's recent bid to become emperor. The province was probably formalised around 214 by Severus's son Caracalla.

Including most of modern northern England and the Midlands, the region was governed from the city of Eboracum (modern York) by a praetorian legate in command of a single legion stationed in the city. This subdivision of Britannia lasted throughout the Severan dynasty until the reorganisation of the empire under Diocletian in 296.

Watling Street is a historic route in England, running from Dover and London in the southeast, via St Albans to Wroxeter. The road crosses the River Thames at London and was used in Classical Antiquity, Late Antiquity, and throughout the Middle Ages. It was used by the ancient Britons and paved as one of the main Roman roads in Britannia (Roman-governed Great Britain during the Roman Empire). The line of the road was later the southwestern border of the Danelaw with Wessex and Mercia, and Watling Street was numbered as one of the major highways of medieval England.

First used by the ancient Britons, mainly between the areas of modern Canterbury and St Albans using a natural ford near Westminster, the road was later paved by the Romans. It connected the ports of Dubris (Dover), Rutupiae (Richborough Castle), Lemanis (Lympne), and Regulbium (Reculver) in Kent to the Roman bridge over the Thames at Londinium (London). The route continued northwest through Verulamium (St Albans) on its way to Viroconium Cornoviorum (Wroxeter). Watling Street is traditionally cited as having been the location of the Romans' defeat of Boudica, though precisely where on the route is disputed.

The Iceni (/aɪˈsiːnaɪ/ eye-SEEN-eye, Classical Latin: [ɪˈkeːniː]) or Eceni were an ancient tribe of eastern Britain during the Iron Age and early Roman era. Their territory included present-day Norfolk and parts of Suffolk and Cambridgeshire, and bordered the area of the Corieltauvi to the west, and the Catuvellauni and Trinovantes to the south. In the Roman period, their capital was Venta Icenorum at modern-day Caistor St Edmund.

Julius Caesar does not mention the Iceni in his account of his invasions of Britain in 55 and 54 BC, though they may be related to the Cenimagni, whom Caesar notes as living north of the River Thames at that time. The Iceni were a significant power in eastern Britain during Claudius' conquest of Britain in AD 43, following which they allied with Rome. Increasing Roman influence on their affairs led to revolt in AD 47, though they remained nominally independent under king Prasutagus until his death around AD 60. Roman encroachment after Prasutagus' death led his wife Boudica to launch a major revolt from 60–61. Boudica's uprising seriously endangered Roman rule in Britain and resulted in the burning of Londinium and other cities. The Romans finally crushed the rebellion, and the Iceni were increasingly incorporated into the Roman province.

The London Wall is a defensive wall first built by the Romans around the strategically important port town of Londinium in c. AD 200, as well as the name of a modern street in the City of London, England.

Roman London was, from around 120–150, protected by a large fort, with a large garrison, that stood to its north-western side. The fort, now referred to as the Cripplegate Fort, was later incorporated into a comprehensive city-wide defence, with its strengthened northern and western sides becoming part of the Wall which was built around 200. The incorporation of the fort's walls gave the walled area its distinctive shape in the north-west part of the city.