WHAT YOU'LL LEARN
Pevensey Castle
Pevensey Castle in East Sussex is the AQA GCSE History historic environment site for Norman England (c1066–c1100) in the 2026 exams. William the Conqueror landed at Pevensey Bay on 28 September 1066, and within days had built a fortification inside the walls of a Roman fort that had stood for seven centuries. This page covers the site's Roman origins, its role in the Norman Conquest, its architecture, and what it reveals about how William secured his grip on England.
Why does Pevensey Castle matter?
Think about this: if you were invading a foreign country with thousands of soldiers, horses, and supplies, what would you need first? You would need somewhere safe to land, somewhere to store food and equipment, and somewhere to defend yourself if attacked before you could advance. In 1066, William of Normandy needed exactly these things — and Pevensey gave him all of them.
Pevensey Castle stands near the town of Pevensey in East Sussex, on the south coast of England. The site has two distinct layers of history. The outer walls are Roman — the fort of Anderida, built in the late third or early fourth century AD as part of the Saxon Shore defence system. Inside those Roman walls, William the Conqueror built a motte-and-bailey castle in the days immediately following his landing in September 1066. The combination of Roman fortification and Norman addition makes Pevensey one of the most historically layered sites in England.
For the AQA 2026 GCSE History exam, this is the historic environment site for Norman England. Examiners will ask questions about the site's purpose, its design, and what it reveals about the Norman Conquest and the challenges William faced in securing England. Everything on this page is designed to prepare you for those questions.
The Roman foundation: what William found
When William landed at Pevensey Bay on 28 September 1066, he did not land on an empty beach. He landed adjacent to the walls of a Roman fort that had already stood for more than seven hundred years.
Anderida was built by the Romans as part of a network of forts along the southern and eastern coast of Britain. These forts — collectively known as the Forts of the Saxon Shore — were constructed to defend against raids from Germanic tribes, particularly the Saxons, who were crossing the North Sea in increasing numbers from the late third century onwards.
The Roman walls of Anderida were formidable. They were constructed from local sandstone bonded with Roman tile, stood up to ten metres high, and enclosed an area of approximately four hectares (roughly the size of six football pitches). By the time of the Norman Conquest, the Roman fort was centuries old, partially ruined, but its walls still stood. William immediately recognised the military value of what was in front of him.
Key term
Saxon Shore forts
A network of Roman coastal fortifications built from the late third century AD to defend against raids from Germanic tribes. Pevensey (Roman name: Anderida) was one of approximately ten such forts along the coasts of what are now southern and eastern England. The thick Roman walls that William found still standing in 1066 were originally built to keep out the ancestors of the very people William was now conquering.
William lands at Pevensey: September 1066
The landing at Pevensey was not accidental. William had chosen his landing site carefully, and Pevensey Bay offered a natural harbour sheltered enough for his fleet of approximately 700 transport ships to beach safely. The bay lay on the Sussex coast, in a part of England that was relatively close to Normandy across the Channel and distant from Harold's army, which had just marched south from Yorkshire after defeating Harald Hardrada at the Battle of Stamford Bridge on 25 September.
William came ashore with an army estimated at between 7,000 and 10,000 men — infantry, cavalry, and archers — along with horses, weapons, food supplies, and even pre-fabricated castle components that had been shipped across the Channel. The first thing he did on landing was to build a fortification. Contemporary sources, including the Bayeux Tapestry, show workers digging and throwing up the earth mound that formed the motte of William's first English castle.
The choice of Pevensey was also strategic in another sense. By building inside the existing Roman walls, William gave his army a defended base from which to operate while he waited for Harold to march south. Pevensey secured his beachhead — the foothold from which the entire conquest would be launched.
Key individual
William, Duke of Normandy (c.1028-1087)
Duke of Normandy from 1035 and King of England from 1066 to 1087. William claimed the English throne on the basis that Edward the Confessor had promised it to him and that Harold Godwinson had sworn an oath to support his claim. His landing at Pevensey on 28 September 1066 began the military campaign that culminated in the Battle of Hastings on 14 October. He is known to history as William the Conqueror.
The motte-and-bailey castle
The castle William built inside the Roman walls followed the standard Norman design of the period: the motte-and-bailey.
The motte was a large earthen mound, steep-sided and raised as high as possible to give height advantage in combat. On top of the motte sat a wooden tower — the keep — which served as the lord's residence and last line of defence. At Pevensey, the motte was built in the south-east corner of the Roman enclosure, using the existing Roman walls as part of its outer defence.
The bailey was an enclosed courtyard adjacent to the motte, protected by a wooden palisade (fence) and a ditch. The bailey contained the practical structures of the castle: stables, storehouses, a hall for soldiers, and workshops. It was the working heart of the fortification, while the motte was its military strongpoint.
Key term
Motte-and-bailey castle
The standard Norman castle design of the eleventh century. A motte is a raised earthen mound topped with a wooden tower; a bailey is an enclosed courtyard at the base, surrounded by a wooden fence and ditch. Motte-and-bailey castles could be built quickly — sometimes in days — using local labour and materials. William built several during his campaign of 1066-1067, including at Pevensey, Hastings, and Dover. They were not permanent structures: over time, the wooden elements were typically replaced with stone.
The motte-and-bailey design had a crucial advantage: it could be built rapidly. Earthwork and timber construction required no specialist stone-cutters or long supply chains. William's army could erect a functional castle in days, securing each position as his forces advanced northward. This speed was essential in 1066: William needed defended bases faster than Harold could respond.
At Pevensey, the Roman outer walls gave the bailey an unusually large and already-fortified perimeter. The combination of ancient Roman stonework and new Norman earthwork created a site that was both large enough to shelter an army and defensible against attack.
From conquest to stone: the castle after 1066
After the Battle of Hastings and William's coronation on Christmas Day 1066, Pevensey's immediate strategic importance diminished. William moved his operations northward, building castles at key towns to control the conquered population. Pevensey was granted to his half-brother, Robert of Mortain, who became one of the most powerful Norman lords in England.
Under Robert, and under subsequent owners, the wooden elements of the Pevensey castle were gradually replaced with stone. The stone keep and curtain walls of the inner bailey — the remains visitors see today — were constructed in the twelfth and thirteenth centuries. The Roman walls of the outer enclosure survived and continued to form the outer perimeter of the medieval castle complex.
Key individual
Robert of Mortain (c.1031-1090)
Half-brother of William the Conqueror and one of the largest landholders in post-Conquest England. William granted Robert the rape (administrative district) of Pevensey after the Conquest, making him the lord of a vast swathe of Sussex. Robert received over 790 manors across England — one of the largest individual grants of the Conquest. His tenure at Pevensey reflects the broader Norman pattern of rewarding loyal followers with confiscated English lands.
What does Pevensey tell us about the Norman Conquest?
A historic environment question in the AQA exam will ask you to analyse what a site reveals about the period — not just describe it. Here are the key analytical angles for Pevensey:
The speed and confidence of the Norman operation. William arrived with pre-fabricated castle components and began building within days of landing. This tells us that the Normans had planned for rapid fortification — they understood that holding territory required not just military victory but physical control of the land expressed in stone (or at least timber). Pevensey was not improvised; it was part of a systematic approach to conquest.
The reuse of existing structures. By building inside the Roman fort rather than constructing a new site from scratch, William demonstrated both pragmatism and an understanding of strategic geography. The Saxon Shore forts had been built where they were for good military reasons: natural harbours, defensible positions, visibility of the coast. Seven centuries later, those reasons still applied.
The distribution of power through castle-building. After the Conquest, William distributed key castles to trusted followers — Robert of Mortain at Pevensey, his other half-brother Odo at Dover, and so on. This pattern of castle grants was the physical expression of the new feudal order William imposed on England. Each castle was a statement of Norman power in a particular locality, a garrison point, and a symbol of who now controlled the land.
Return to the question at the start: what did an invading army need first? Safety, supply, and a base to advance from. Pevensey gave William all three. The Roman walls that had once kept out Saxon raiders were now sheltering Norman conquerors. The site is a monument to the fact that in 1066, England's geography shaped its history as much as any army.
Revision checklist
Before moving on, make sure you can answer:
1. What was the Roman name and original purpose of the fort at Pevensey, and when was it built? 2. Why did William choose Pevensey as his landing site in September 1066? 3. Describe the design of a motte-and-bailey castle. What were its advantages for a conquering army? 4. How did William make use of the existing Roman walls at Pevensey? 5. Who was granted Pevensey after the Conquest, and what does this tell us about how William rewarded loyalty? 6. How did the castle change in the decades after 1066? 7. What does Pevensey Castle reveal about the Norman approach to conquest and control? 8. Why is Pevensey described as a site with "two distinct layers of history"?