Motte-and-bailey castle

A motte-and-bailey castle is a European fortification with a wooden or stone keep situated on a raised area of ground called a motte, accompanied by a walled courtyard, or bailey, surrounded by a protective ditch and palisade. Relatively easy to build with unskilled labour, but still militarily formidable, these castles were built across northern Europe from the 10th century onwards, spreading from Normandy and Anjou in France, into the Holy Roman Empire in the 11th century. The Normans introduced the design into England and Wales. Motte-and-bailey castles were adopted in Scotland, Ireland, the Low Countries and Denmark in the 12th and 13th centuries. Windsor Castle, in England, is an example of a motte-and-bailey castle. By the end of the 13th century, the design was largely superseded by alternative forms of fortification, but the earthworks remain a prominent feature in many countries. A motte-and-bailey castle was made up of two structures: a motte (a type of mound – often artificial – topped with a wooden or stone structure known as a keep); and at least one bailey (a fortified enclosure built next to the motte). The constructive elements themselves are ancient, but the term motte-and-bailey is a relatively modern one and is not medieval in origin. The word motte is the French version of the Latin mota, and in France, the word motte, generally used for a clump of turf, came to refer to a turf bank, and by the 12th century was used to refer to the castle design itself. The word "bailey" comes from the Norman-French baille, or basse-cour, referring to a low yard. In medieval sources, the Latin term castellum was used to describe the bailey complex within these castles. One contemporary account of these structures comes from Jean de Colmieu around 1130, describing the Calais region in northern France. De Colmieu described how the nobles would build "a mound of earth as high as they can and dig a ditch about it as wide and deep as possible.