When was london founded

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Last updated: April 17, 2026

Quick Answer: London was founded by the Romans in **43 AD**, who named it **Londinium** after establishing a settlement following their invasion of Britain. The city was strategically located on the River Thames and quickly grew into a major trading and administrative center.

Key Facts

London was founded by the Romans in **43 AD** following the invasion of Britain under Emperor Claudius.
The original Roman settlement was named **Londinium** and established near the current site of the City of London.
Archaeological evidence suggests the area was inhabited before the Romans, but Londinium marks the official founding.
By **61 AD**, Londinium was destroyed during Boudica’s revolt but was quickly rebuilt by the Romans.
London became the capital of Roman Britain and remained a key city throughout the medieval and modern periods.

Overview

London, one of the world’s most influential cities, traces its origins to a Roman military and trade settlement established in **43 AD**. After Emperor Claudius launched the Roman conquest of Britain, troops founded a strategic outpost at a crossing point on the River Thames, naming it **Londinium**. This marked the beginning of continuous urban development that evolved into today’s global metropolis.

While pre-Roman activity existed in the region, including Celtic tribes like the Catuvellauni, there was no organized urban center before the Romans arrived. Londinium’s location provided access to continental Europe and inland Britain, making it ideal for trade and military control. Over time, the settlement grew rapidly despite early setbacks, such as its destruction in 61 AD.

Founded in 43 AD: The Romans established Londinium shortly after landing in Britain, using it as a bridgehead for further expansion into the province.
Strategic river crossing: The Thames was fordable at this point, and the Romans built a bridge, enabling trade and troop movements across southern Britain.
Destroyed in 61 AD: Queen Boudica of the Iceni tribe led a revolt, sacking Londinium, which was then rebuilt with stronger fortifications.
Population growth: By the 2nd century, Londinium had an estimated population of **45,000–60,000**, making it one of the largest cities in Roman Britain.
Administrative hub: Londinium became the capital of the Roman province of Britannia and housed a governor’s palace, forum, and basilica.

How It Works

Understanding how London evolved from a Roman outpost into a global city involves examining key historical, geographic, and political factors. Each phase of development—from Roman foundations to medieval expansion—shaped its current form and function.

Founding Date: The official founding is marked as 43 AD when Roman legions under Aulus Plautius established Londinium after landing in Kent.
Urban Planning: The Romans used a grid layout with roads like Watling Street connecting Londinium to other major settlements such as Verulamium and Wroxeter.
Economic Role: As a port city, Londinium handled goods such as grain, iron, and pottery, linking Britain to the wider Roman Empire.
Military Significance: The city was fortified with a wall by the late 2nd century, parts of which still stand today near the Tower of London.
Christian Influence: By the 4th century, Londinium had Christian communities, reflecting the Empire’s religious shift under Emperor Constantine.
Post-Roman Survival: After Roman withdrawal in 410 AD, the city declined but was reoccupied by Anglo-Saxons, who called it Lundenwic.

Comparison at a Glance

London’s founding and early development compared to other major European capitals:

City	Founded	Founders	Original Name	Key Early Function
London	43 AD	Romans	Londinium	Trade and military hub
Rome	753 BC	Legendary Romans	Roma	Political and religious center
Paris	3rd century BC	Gauls (Parisii)	Lutetia	River port and regional capital
Vienna	1st century AD	Romans	Vindobona	Military frontier post
Athens	5th millennium BC	Neolithic settlers	Athēnai	Philosophical and cultural center

This comparison highlights how London’s founding was relatively late compared to ancient capitals like Athens or Rome, but it shared similarities with other Roman-founded cities such as Paris and Vienna. Its rise was driven by imperial strategy rather than cultural or mythological origins.

Why It Matters

Understanding when and how London was founded helps explain its enduring significance as a political, economic, and cultural center. Its Roman roots laid the foundation for a city that would become the heart of a global empire and a leading financial capital.

Modern infrastructure: Many of London’s streets follow Roman routes, such as Old Street and Watling Street, still in use today.
Global influence: The city’s early role in trade foreshadowed its later status as a hub of international commerce and finance.
Historical continuity: London has been continuously inhabited for nearly 2,000 years, making it one of Europe’s oldest living cities.
Tourism and heritage: Roman sites like the London Wall and the Museum of London attract millions of visitors annually.
Urban planning legacy: The Roman grid influenced later medieval and modern city layouts, shaping central London’s structure.
Educational value: Studying Londinium provides insight into Roman engineering, governance, and colonial strategies in ancient Europe.

From its origins as a strategic Roman outpost to its current status as a world city, London’s founding in 43 AD marks the beginning of a remarkable journey of resilience, adaptation, and growth.