The Romans knew London by which name?

Londinium, also known as Roman London, was the capital of Roman Britain during most of the period of Roman rule. It was originally a settlement established on the current site of the City of London around AD 47–50. It sat at a key crossing point over the River Thames which 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 the foundation of the town in the mid-1st century, early Londinium occupied the relatively small area of 1.4 km2 (0.5 sq mi), roughly half the area of the modern City of London and equivalent to the size of present-day Hyde Park. In the year 60 or 61, the rebellion of the Iceni under Boudica compelled the Roman forces to abandon the settlement, which was then razed.