Baileys were large enclosures around the main tower of a motte and bailey castle. They were defended by a large bank with a palisade or wall and a ditch. If there were a series of baileys these may each be defensive on their own. It need not have been contemporary to the motte in origin. Sometimes a motte could be added to an existing defensive enclosure, while in a bailey could be added to an isolated motte. Sometimes baileys are found without a motte - they are then called ring works.