Motte-and-bailey castle
A medieval fortification of mound and courtyard, built with unskilled labour.
A motte-and-bailey castle is a European fortification consisting of a wooden or stone keep on a raised mound (motte) and a walled courtyard (bailey) surrounded by a ditch and palisade. Relatively easy to build with unskilled labour yet militarily formidable, these castles spread across northern Europe from the 10th century onward, becoming popular in Normandy, Anjou, the Holy Roman Empire, the Low Countries, England, Wales, Scotland, Ireland, and Denmark. By the end of the 13th century, the design was largely superseded by other fortifications, but the earthworks remain prominent in many countries.
- Type
- Fortification
- Period
- 10th to 13th centuries
- Region
- Northern Europe (Normandy, Anjou, Holy Roman Empire, Low Countries, England, Wales, Scotland, Ireland, Denmark)
- Key features
- Motte (mound with keep) and bailey (walled courtyard with ditch and palisade)
- Construction time
- Larger mottes estimated 4–9 months; smaller mottes as little as 1,000 man-days
- Motte height range
- 3 to 30 metres (10–100 feet)
Lore & Background
The term motte-and-bailey is modern, not medieval. The word 'motte' comes from French, derived from Latin 'mota', originally meaning a clump of turf, and by the 12th century referred to the castle design. 'Bailey' comes from Norman-French 'baille' or 'basse-cour', meaning a low yard. In medieval sources, the Latin 'castellum' described the bailey complex. A contemporary account from Jean de Colmieu around 1130 describes nobles in the Calais region building a mound of earth as high as possible, digging a ditch around it, and enclosing the top with a palisade of hewn logs strengthened with towers, with a keep commanding the defences and a bridge reaching the top.
Reader's Guide
Motte-and-bailey castles were significant because they offered a relatively quick and cost-effective means of establishing military control, especially after the Norman invasion of England, where forced peasant labour made them attractive. They could be built in months rather than the years required for stone keeps. The design varied widely: mottes could be 3 to 30 metres high, with most in England and Wales under 5 metres. Baileys could be kidney-shaped or other forms, and some castles had multiple baileys or two mottes. Construction methods included building the mound first or burying a pre-built tower. The type of soil influenced the steepness of the motte. By the late 13th century, the design was largely replaced by other fortifications, but the earthworks remain visible across many countries, serving as enduring archaeological markers of medieval military and social organization.
Did You Know?
- Only 7% of mottes in England and Wales were taller than 10 metres; 69% were less than 5 metres tall.
- The largest mottes in England, such as Thetford Castle, required up to 24,000 man-days of work.
- Wooden structures on mottes could be protected by skins and hides to prevent easy burning during a siege.
- Some mottes were built over older artificial structures, such as Bronze Age barrows.
More in Castles by type 1-24
Spotted an error? Know more?
Reader corrections go straight into our review queue. Suggest an edit · How this site is sourced