| Date | 43 CE – c. 410 CE |
| Location | Londinium (City of London), Roman Britain |
| Caused by | Claudian invasion of Britain, 43 CE; Boudican Revolt, 60 CE |
| Resulted in | Establishment of Roman provincial capital; destruction and rebuilding of Londinium; Roman withdrawal c. 410 CE |
| Parties | Roman Empire · Iceni tribe · Trinovantes tribe · Province of Britannia |
| Lead figures | Aulus Plautius, Boudica, Gaius Suetonius Paulinus, Catus Decianus, Emperor Claudius |
Roman London, known in antiquity as *Londinium*, was the Roman-administered settlement established on the north bank of the River Thames following the Claudian invasion of Britain in 43 CE. Within three decades of its foundation, Londinium had become the largest city in the province of Britannia and served as its administrative capital, a status it retained — with one significant interruption — until the Roman withdrawal from Britain in approximately 410 CE.
In 43 CE, Emperor Claudius dispatched a force of approximately 40,000 legionaries and auxiliaries under the command of Aulus Plautius to subjugate the island of Britain. The invasion force crossed the Channel in three divisions, landing in the vicinity of modern Richborough, Kent. Following decisive engagements at the River Medway and the Thames estuary, Roman forces established a bridgehead at a point where the Thames narrowed sufficiently to permit a permanent crossing — a site corresponding roughly to the northern end of what is now London Bridge. The name *Londinium* is believed to derive from a pre-Roman Brittonic placename, though its precise etymology remains contested among scholars of [Indo-European Morphology](/wiki/indo-european-morphology) and Celtic linguistics.
The settlement grew rapidly around the bridgehead. By approximately 50 CE, a formal grid of streets had been laid and timber-framed commercial buildings established along the waterfront. Londinium's position at the tidal limit of the Thames made it a natural hub for both river and overland trade, and it attracted merchants from across the Empire within a generation of its foundation.
### 60 CE
In 60 CE, Prasutagus, king of the Iceni tribe of East Anglia, died without a male heir. Under the terms of a prior agreement with Rome, he had left his kingdom jointly to his two daughters and to Emperor Nero. Roman administrators, however, declined to honour the arrangement. Provincial procurator Catus Decianus ordered the annexation of Iceni territory, the flogging of Prasutagus's widow Boudica, and the seizure of Iceni tribal nobility as slaves.
### The Revolt
Boudica led a coalition of the Iceni and the neighbouring Trinovantes in a coordinated uprising that destroyed three Roman centres in rapid succession: Camulodunum (Colchester), then Londinium, and finally Verulamium (St Albans). The governor of Britannia, Gaius Suetonius Paulinus, was engaged in a campaign against the druids of the island of Mona (Anglesey) when the revolt began. Calculating that Londinium could not be defended with his available forces — estimated by the historian Tacitus at no more than ten thousand men — Suetonius evacuated the military garrison and left the civilian population to the advancing forces.
Archaeological excavations across the City of London, including work conducted under the supervision of the [City of London Corporation](/wiki/city-of-london-corporation) and recorded in part at the [Guildhall Library](/wiki/guildhall-library), have identified a distinct layer of red-burnt debris approximately 47 centimetres deep across multiple excavation sites. This stratum — dated consistently to circa 60–61 CE by ceramic and coin evidence — represents the physical record of Boudica's destruction of Londinium. The layer contains charred grain, melted pottery, and fragments of bronze fittings consistent with the systematic burning of a commercial district.
### Aftermath
Suetonius engaged Boudica's forces at a location that has not been conclusively identified, though several scholars associated with the [University of Edinburgh](/wiki/university-of-edinburgh) have placed the engagement in the West Midlands, near modern Mancetter, Warwickshire. The Roman forces, though substantially outnumbered, employed a narrow defile to neutralise the numerical advantage of the Iceni coalition. The battle resulted in a decisive Roman victory. Boudica died shortly afterward — Tacitus records that she took poison, though Cassius Dio states she died of illness.
Following the suppression of the revolt, the Emperor Nero dispatched Quintus Petronius Turpilianus as the new governor of Britannia, with instructions to pursue a policy of measured reconstruction rather than punitive reprisal. Londinium was rebuilt on a more ambitious scale. By approximately 70 CE, a new forum and basilica — the largest north of the Alps at the time of their construction — had been established at the city's centre, corresponding to the area around modern Gracechurch Street. A governor's palace (*praetorium*), identified by excavations recorded in the [London Metropolitan Archives](/wiki/london-metropolitan-archives), occupied a substantial site adjacent to the waterfront. A fort garrisoning approximately 1,000 soldiers was constructed in the city's northwest corner around 120 CE; its outline survives in the street plan of the modern [Barbican Estate](/wiki/barbican-estate).
The Roman city wall, constructed in approximately 190–225 CE, enclosed an area of roughly 330 acres, making Londinium one of the largest walled cities in the western provinces. Sections of the wall remain visible above ground, most notably near Tower Hill and at [St Botolph Without Aldersgate](/wiki/st-botolph-without-aldersgate) on [Aldersgate Street](/wiki/aldersgate-street).
Londinium reached its peak population — estimated at between 45,000 and 60,000 inhabitants — in the late second century CE, after which it entered a gradual demographic decline that is reflected in archaeological evidence of abandoned buildings and reduced commercial activity through the third and fourth centuries. The reasons for this decline remain debated; proposed factors include economic contraction following the crisis of the third century, a reduction in long-distance trade, and administrative reorganisation under Diocletian, which elevated York (*Eboracum*) as a co-capital of the western Empire.
Roman administrative structures in Londinium formally ceased following the withdrawal of Roman legions from Britain, conventionally dated to 410 CE when Emperor Honorius advised British cities to organise their own defence. The physical fabric of Londinium — its streets, walls, and foundations — continued to shape the topography of the city for centuries afterward. The modern street pattern of the City of London retains traces of the Roman grid, and the Roman wall defined the city's boundaries for administrative purposes well into the medieval period, as recorded in charters held by the [City of London Corporation](/wiki/city-of-london-corporation).
Londinium has appeared as a setting in numerous works of historical fiction, most prominently in the novels of Rosemary Sutcliff, whose 1954 work *The Eagle of the Ninth* drew on archaeological scholarship then current at the time of its composition. The BBC television series *Britannia* (2017–2021) depicted the Claudian invasion and its aftermath, drawing partial criticism from archaeologists for conflating the chronology of the Boudican revolt with the construction of the second-century forum. The Museum of London, prior to its relocation, maintained a permanent gallery dedicated to Roman Londinium, incorporating sections of the Roman wall and a reconstructed first-century waterfront. The [Guildhall, London](/wiki/guildhall-london) stands on a site that has been associated with Roman public building since excavations in the 1990s revealed arena-wall foundations consistent with an amphitheatre capable of seating approximately 6,000 spectators.