A general outline of Roman London in late antiquity, with the modern banks of the Thames.[1] Discovered roads drawn as double lines; conjectural roads, single lines.

Londinium was a settlement established on the current site of the City of London around AD 43. Its bridge over the River Thames turned the city into a road nexus and major port, serving as a major commercial centre in Roman Britain until its abandonment during the 5th century.

Following its foundation in the mid-1st century, early Londinium occupied the relatively small area of 1.4 km2 (0.5 sq mi), roughly equivalent to the size of present-day Hyde Park, with a fortified garrison on one of its hills. In the year 60 or 61, the rebellion of the Iceni under Boudica forced the garrison to abandon the settlement, which was then razed. Following the defeat of Boudica by the Roman governor Gaius Suetonius Paulinus, the city was rebuilt as a planned Roman town and recovered within about a decade. During the later decades of the 1st century, Londinium expanded rapidly, becoming Great Britain's largest city. By the turn of the century, Londinium had grown to perhaps 30,000 or 60,000 people, almost certainly replacing Camulodunum (Colchester) as the provincial capital and by the mid-2nd century, Londinium was at its height. Its forum and basilica were one of the largest structures north of the Alps when the Emperor Hadrian visited Londinium in 122. Excavations have discovered evidence of a major fire that destroyed most of the city shortly thereafter, but the city was again rebuilt. By the second half of the 2nd century, Londinium appears to have shrunk in both size and population.

Although Londinium remained important for the rest of the Roman period, no further expansion resulted. Londinium supported a smaller but stable settlement population as archaeologists have found that much of the city after this date was covered in dark earth—the by-product of urban household waste, manure, ceramic tile, and non-farm debris of settlement occupation, which accumulated relatively undisturbed for centuries. Sometime between 190 and 225, the Romans built a defensive wall around the landward side of the city. Along with Hadrian's Wall and the road network, this wall was one of the largest construction projects carried out in Roman Britain. The London Wall survived for another 1,600 years and broadly defined the perimeter of the old City of London.

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The etymology of the name Londinium is unknown. Following Geoffrey of Monmouth's pseudohistorical History of the Kings of Britain,[2][3] it was long derived from an eponymous founder named Lud, son of Heli. There is no evidence such a figure ever existed. Instead, the Latin name was probably based on a native Brittonic placename reconstructed as *Londinion.[5] Morphologically, this points to a structure of two suffixes: -in-jo-. However, the Roman Londinium was not the immediate source of English "London" (Old English: Lunden), as i-mutation would have caused the name to have been Lyndon. This suggests an alternative Brittonic form Londonion;[8] alternatively, the local pronunciation in British Latin may have changed the pronunciation of Londinium to Lundeiniu or Lundein, which would also have avoided i-mutation in Old English.[9] The list of the 28 Cities of Britain included in the 9th-century History of the Britons precisely notes London[10] in Old Welsh as Cair Lundem[11] or Lundein.[10][13]