In motte-and-bailey castles, what is referred to as the motte?

In motte-and-bailey castles, the term "motte" specifically refers to the raised earthwork or mound on which a wooden or stone keep, or fortified building, is constructed. This structure is elevated to provide a tactical advantage, allowing for better visibility and defense against attackers. The height of the motte aids in its role as a stronghold, making it more difficult for enemies to assault effectively.

The other choices represent different features of a motte-and-bailey castle that are significant but do not define the motte itself. A ditch surrounding the castle serves as an additional defensive mechanism and is related to the overall fortifications but is not the motte. The outer enclosure, known as the bailey, is a flat area that typically houses living quarters and workshops but is distinct from the raised motte. Lastly, a defensive wall surrounding the bailey further protects the settlement within, adding to the complexity of the castle’s defenses but does not pertain to what the motte is.