Note 256 — Chapter VII · THE CASTLES OF THE NORMANS IN ENGLAND
Reading edition
The expenses entered in the Pipe Rolls (1170-1187) are for the works of the castle, the chamber and wall of the castle, the houses of the castle (an expression which generally refers to the keep), and for flooring the tower (turris) and making a garden. Turris is the usual word for a keep, and is never applied to a mere mural tower.