Bailey

Webster's Dictionary

(1): (n.) The outer wall of a feudal castle.

(2): (n.) The space immediately within the outer wall of a castle or fortress.

(3): (n.) A prison or court of justice; - used in certain proper names; as, the Old Bailey in London; the New Bailey in Manchester.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

(Lat. ballium), a name given to the courts or wards of a castle formed by the spaces between the circuits of walls or defences which surrounded the keep: sometimes there were two or three of these courts between the outer wall and the keep, divided from each other by embattled walls. The name is frequently retained long after the castle itself has disappeared; as the Old Bailey in London, St. Peter's-in-the-Bailey in Oxford.