Medieval Castles: KS3 History Explained

Medieval castles were fortified buildings designed to defend territory, project military power, and control conquered populations. The Normans introduced castle-building to England after 1066 as a deliberate tool of political domination — a visible, permanent statement that the new rulers were here to stay and that resistance was futile.

Why did the Normans build castles in England?

William the Conqueror faced an enormous challenge after the Battle of Hastings in October 1066. He had defeated the English army and killed King Harold, but England was a large, hostile country of roughly two million people who resented foreign rule. William had perhaps 10,000–15,000 Norman soldiers. Castles solved his problem: a small garrison of knights housed inside a defensible stronghold could dominate a town or region far larger than their numbers would otherwise permit.

The Normans began building castles within days of landing in England. The Domesday Book of 1086 records evidence of castle-building across the country, and historians estimate that around 500 castles were constructed in England in the two decades after the Conquest. Each one served as a base from which Norman lords could collect taxes, administer justice, and suppress rebellions.

What was a motte-and-bailey castle?

The first Norman castles were built quickly and cheaply from earth and timber. This design is known as the motte-and-bailey castle.

The motte was a raised mound of earth — sometimes natural, often artificially constructed — with a wooden tower on top. The tower (called the keep) provided a last line of defence and a lookout point over the surrounding countryside. The bailey was an enclosed courtyard at the base of the motte, surrounded by a wooden fence called a palisade, and usually a ditch. Inside the bailey were the stables, kitchens, workshops, and barracks — everything needed to support the garrison.

The motte-and-bailey design had significant advantages: it could be erected in a matter of weeks, required only local materials (earth and timber), and could be built by unskilled labourers under Norman supervision. Its main weakness was vulnerability to fire, and the timber rotted over time.

How did castles evolve into stone keeps?

As the Normans consolidated their power and needed more permanent fortifications, they began replacing timber structures with stone. This transition took place gradually from the late eleventh century onwards.

Castle type | Period | Key features | Example
Motte-and-bailey (timber) | 1066–c.1100 | Earth mound, wooden tower, palisade | Berkhamsted Castle
Shell keep | From c.1100 | Stone wall replacing wooden tower on motte | Windsor Castle (early phase)
Stone keep (tower keep) | From c.1080 | Large rectangular stone tower | White Tower, Tower of London
Concentric castle | 13th–14th century | Multiple rings of stone walls, no single weak point | Beaumaris Castle, Wales

The White Tower at the Tower of London, begun by William the Conqueror around 1078, is the earliest surviving example of a great stone keep in England. Its walls are up to 4.5 metres thick. Stone keeps were expensive and slow to build but offered far greater protection and permanence than timber.

By the thirteenth and fourteenth centuries, military architects had moved to concentric castles — designs with two or more rings of curtain walls, so that attackers who breached the outer wall found themselves trapped under fire from defenders on the inner wall. Edward I's castle-building programme in Wales in the late thirteenth century produced some of the finest concentric castles in Europe, including Beaumaris, Harlech, and Caernarfon.

What were the key features of a castle?

Understanding the terminology is essential for describing and analysing castles.

Keep: The main tower and the most heavily defended part of the castle. It contained the lord's private chambers, a great hall for feasting, and storage for supplies. In a siege, the garrison would retreat to the keep as a last refuge.

Bailey (or ward): The courtyard surrounding the keep, enclosed by the curtain wall. This is where most daily life took place — cooking, training, stabling horses, housing servants.

Curtain wall: The high stone wall surrounding the bailey. Defenders walked along the wall-walk at the top to repel attackers.

Gatehouse: The most heavily defended point of entry, often containing a portcullis (a heavy iron-reinforced wooden grid lowered to block the entrance) and a drawbridge over the moat.

Moat: A water-filled ditch surrounding the castle walls, making it difficult for attackers to approach or undermine the foundations.

Battlements (merlons and crenels): The distinctive toothlike tops of castle walls. Defenders sheltered behind the solid merlons and shot arrows through the gaps (crenels).

Who lived in a castle and what was daily life like?

Castles were not simply military fortresses — they were homes, administrative centres, and symbols of lordly status.

The lord and his family occupied the finest chambers in the keep or, in later castles, a separate domestic range built against the curtain wall. Life for the lord involved managing his estates, holding court, and entertaining guests. The great hall was the social centre of the castle, where the lord ate with his household, dispensed justice, and received visitors.

Knights and soldiers formed the garrison. They were responsible for the defence of the castle and were expected to be ready to ride out on the lord's military campaigns. In peacetime, knights participated in tournaments to keep their skills sharp.

Servants — cooks, grooms, laundresses, carpenters, and many others — made up the majority of the castle's population. Life for servants was hard and hierarchical. Most slept in the great hall or outbuildings.

Historians note that the romantic image of castle life is largely a later invention. Medieval castles were draughty, smoky, and dimly lit. Sanitation was primitive, and comfort was secondary to defence.

How do historians use castles as evidence?

Castles are primary sources in stone. A historian can read a castle's physical fabric the way others read a document.

The location tells us about strategic priorities: the Tower of London controlled river traffic into the city; Clifford's Tower dominated York; Welsh castles cut off communication between communities. Changes to design over time reflect changing technology: round towers deflected missiles better than square ones; gunports appeared in the fifteenth century. Archaeological excavation of castle interiors — pottery, bone deposits, environmental samples — gives evidence of daily life at different periods.

Frequently asked questions

What is the difference between a motte-and-bailey and a stone keep?

A motte-and-bailey castle is the earlier, timber-built design, with an earthen mound (motte) topped by a wooden tower and an adjacent enclosed yard (bailey) protected by a wooden fence and ditch. A stone keep is a later development in which the wooden tower is replaced by a permanent stone structure, far harder to set alight and able to withstand prolonged sieges. The transition from timber to stone took place gradually from the late eleventh century, driven by the need for more durable defences and the growing wealth of Norman lords in England.

Why did the Normans build so many castles so quickly after 1066?

The Normans faced immediate resistance from the English population. Uprisings occurred in the north (the "Harrying of the North" of 1069–70), the east, and the west. Castles provided small Norman garrisons with the ability to dominate large territories — a garrison of perhaps 20–30 knights in a well-positioned motte-and-bailey could control a town of thousands. Speed was essential: earth-and-timber castles could be raised in days or weeks, long before a local population could organise effective resistance.

How were castles attacked?

Attackers had several methods at their disposal. A direct assault involved ladders or siege towers pushed against the walls. Undermining involved digging beneath a corner tower, propping it with timber, then burning the props — the corner would collapse. Battering rams were used against gates. Siege engines — catapults, trebuchets, and later cannon — hurled heavy stones at walls. Most commonly, however, attackers preferred a siege: surrounding the castle and cutting off food, water, and firewood until the garrison was forced to surrender through starvation. Most castle captures in the medieval period came through siege or treachery, not direct assault.

Do historians know exactly how many Norman castles were built in England?

No precise figure exists because many early motte-and-bailey castles have left only earthwork traces — the timber rotted, and later generations ploughed the land flat. Historians combine documentary sources (Domesday Book, chronicle accounts) with field archaeology (aerial photography, LiDAR) to identify castle sites. Current estimates suggest over 1,000 castle sites across England, with the greatest concentration in the decades immediately following 1066.

For Socratic KS3 history practice — weighing castle evidence and building your own arguments about Norman control — visit aitutors.me.