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Massive earth ramparts and ditches are constructed, which will provide the foundation for the medieval castle's curtain walls. Regular cross-Channel trading takes place.
The Romans build a lighthouse here to guide ships into the harbour, the base of the fleet patrolling the Channel.
Eadbald, King of Kent, founds a minster church for 22 monks in the 'castrum' of Dover - either the Roman fort in the town or the hillfort on the headland.
The church of St Mary in Castro is built beside the lighthouse.
William the Conqueror defeats King Harold, then turns to Dover. He takes the town, burns it, and builds fortifications there, before heading to London for his coronation.
Find out more about the history of Dover Castle
Henry II rebuilds Dover Castle, spending vast sums on it. It is the most expensive castle project of its time.
King John establishes the first royal fleet and completes the castle's outer defences.
After King John reneges on Magna Carta, Prince Louis of France invades England and besieges Dover Castle. It is successfully defended by a few hundred men.
Under Henry III, enormous sums are spent strengthening Dover, making it one of the largest and most strategically important castles in England.
Simon de Montfort challenges Henry III's government and captures Dover Castle. The future Edward I is briefly held prisoner here.
After de Montfort is killed in battle his wife, Eleanor, leads the defence of Dover, holding out with 29 archers. She is forced to surrender to Prince Edward when he brings troops from London.
On 25 May the Holy Roman Emperor, Charles V, arrives at Dover for a meeting with Henry VIII. The emperor probably stays in the great tower.
Henrietta Maria, the teenage French princess, occupies the castle but is said to be 'poorly accommodated'. It is later refurbished by George Villiers, 1st Duke of Buckingham.
The garrison of 20 remains loyal to Charles I. A daring merchant called Drake and 11 men scale the cliffs and take the castle for Parliament, with few shots fired.
England faces the threat of French invasion, so the defences are upgraded.
Huge sums are spent on the town and castle defences. Barracks are constructed in a complex of tunnels beneath the castle.
Major renovations take place again with the threat of invasion from Napoleon III.
The top floor of the Great Tower is furnished with displays of armour and opened to the public.
The church of St Mary in Castro, Roman lighthouse and Colton's Gate are transferred to the Ancient Monuments Branch of the Ministry of Works.
The Napoleonic tunnels have a new role as naval and later combined services headquarters, where the Dunkirk evacuation is masterminded. Air attacks earn the area around Dover the nickname 'Hellfire Corner'.
The castle's last gun batteries are scrapped.
After the Cuban Missile Crisis, the tunnels are renovated and equipped to serve as one of 12 regional seats of government in the event of nuclear war.
The castle is transferred to the Ministry of Works for preservation as an Ancient Monument.
Learn more about the history of Dover Castle
English Heritage cares for over 400 historic buildings, monuments and places - from world-famous prehistoric sites to grand medieval castles, from Roman forts on the edges of empire to a Cold War bunker. Through these, we bring the story of England to life for over 10 million people each year. The English Heritage Trust is a charity, no. 1140351, and a company, no. 0744722, registered in England.