Chapter XXVII: Appendix: R

THE SO-CALLED SHELL KEEP

We have three accounts of motte-castles from the 12th century: that of Alexander Neckham, in the treatise _De Utensilibus_; that of Laurence of Durham, cited in Chapter VII., p. 147; and the well-known description of the castle of Marchem, also cited in Chapter VI., p. 88. All these three describe the top of the motte as surrounded by a wall (of course of wood), within which is built a wooden tower. The account of Marchem says that it was built in the middle of the area. This supports the conjecture in the text. Mr H. E. Malden has shown (_Surrey Archæolog. Collections_, xvi., 28) that the keep of Guildford is of later date than the stone wall round the top of the motte. Remove this tower, and there would be what is commonly called a shell keep. It would appear, therefore, that it was a common practice to change the bank or stockade round the top of the motte into a stone wall (no doubt as a defence against fire), leaving the keep inside still of wood. Four of the pictures from the Bayeux Tapestry (see Frontispiece) all give the idea of a wooden tower inside a stockade on a motte.