When Did London Become the Capital City?

London's path to capital status was gradual, not a single event.

Timeline

• 43 AD: Romans found Londinium—major port, administrative center of Britannia.
• ~410 AD: Roman withdrawal. London declines but persists as trading hub.
• 9th–10th C.: Alfred the Great refortifies London (886) as a burh against Vikings. Commercial revival.
• 1066: William the Conqueror crowned in Westminster Abbey. London becomes royal center.
• 12th–13th C.: Permanent royal treasury/exchequer at Westminster. Parliament begins meeting there. De facto capital.
• 14th C.: London is undisputed political, economic, and cultural capital of England.

Key Distinction

City of London (the "Square Mile") gained Roman city status and retains unique governance. Westminster (adjacent) became the royal/government center. Together they form "London." The shift from Winchester (former Wessex/English capital) to London occurred over centuries, cemented by the Norman Conquest and the growth of Westminster as the seat of government.