This fortified building was customarily one to two stories high, and as with the word motte, the original donjon did not allude to a prison at all, but to the keep itself, where the lord and his lady resided.
Surrounding the motte was the ditch, and when feasible this ditch was filled with water. Some utilized other obstacles instead, such as spikes—whatever seemed formidable and most accessible.
By the turn of the Twelfth century, the small number of castles in 1066 England had grown to more than 500—most built of timber. By the next, they had been converted to masonry, and during the course of these years, influenced by The Crusades, new elaborations appeared—merlons (the solid part in a crenellated parapet), crenels (gaps at regular intervals in a parapet) and muertrieres (murder holes) to name a few. 
Motte and Bailey castle
(original water color by June Blakely)
By the late Twelfth Century, castles were again being renovated in light of new technology. At Chepstow, for example, William Marshall was one of the first to use round wall towers (more difficult to scale) and true arrow loops (narrow slits made to accommodate archers so they could send missiles out, but fewer could be returned to harm them). It was only much, much later, after gunpowder was introduced, that round openings were added to arrow loops to accommodate firearms.
In Europe, by the mid Thirteenth Century, castles had settled into forms that suggested their season of evolution was over. However, in Wales at the end of the century, Edward I was still developing highly sophisticated castles, and yet a full century later, the Scots were still building solid, square keeps that were perfectly suited to their needs.
Key takeaway? Know your castle as well as you do your hero and heroine. The castle has a magnificent history, rife with politics and possibilities, but like the Castles during Edward II’s reign, your story could come tumbling down with the wrong facts.
A few books I’ve enjoyed are: Castle by David Macaulay (book and video), The Castles of Scotland by Maurice Lindsay, anything by R.A. Brown and The Castle in Medieval England and Wales by Colin Platt.
Tanya has written 15 books with eight of them medieval romances. Her books have been translated into Spanish, Italian, French, Russian and Chinese. One of this publisher's favorites of Tanya's medievals is Viking's Price. To keep posted on the status of the novel Tanya is currently writing, please visit her at www.tanyaannecrosby.com.
Note from the publisher: For your convenience, reference book titles have been linked directly to Amazon.com.
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