The story of architecture: an outline of the styles in all countries (1896)
Mathews, Charles Thompson, 1863- · New York, D. Appleton and company · leaf 388
*< Fig. 153.—Chateau de Coucy. KEEPS, SECRET PASSAGES, ETC. 365 In England the donjon was usually square, andcalled a keep, good examples of which may still beseen in Rochester Castle and the White Tower ofthe Tower of London ; but later the square shapewas generally abandoned. Much ingenuity… … Fig. 154.—The barbican. doorways, dungeons, and subterranean exits, theknowledge of which was more than jealously guard-ed. Indeed, on one occasion, Alberade, Countess ofBayeux, ordered the architect Lanfroi to be put todeath lest he might divulge the constructive secretscreated by him in her…
Architecture -- History
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