The Saxons, once subjugated, had to raise a mound twenty-one meters high and surrounded by a dry trench. There were wooden pikes or posts protecting the buildings at the top of the knoll, while to the south and east of the knoll were courtyards protected by banks and ditches, all to set in motion the earthworks for Norwich Castle . Edward Boardman, a Norwich-born architect, completed Norwich Castle, a medieval and fantastic defense structure in the city of Norwich that was one of the greatest castles of its time due to its architecturally advanced structure, a symbol of military power and a symbol of political control founded by the Normans. Norwich Castle, a royal fortification was founded by William the Conqueror between 1066 and 1075. It took on the appearance of a motte and bailey. In the year 1067, William the Conqueror undertook a campaign to conquer East Anglia and, according to military historian R. Allen Brown, it was most likely around this event that Norwich Castle was founded. The castle is first mentioned in 1075 when Ralph de Gael, Earl of Norfolk, rebelled against William the Conqueror and Norwich was captured by his men. A siege was undertaken, but ended when the garrison was taken, promising that they would not be killed. Norwich Castle was the center point of a rebellion in 1075. This involved Normans against Normans, the rebellion began when William the Conqueror was busy with business in Normandy. . Ralph de Guader, married Emma, ​​daughter of a Norman baron. At the wedding, three Norman barons plotted to accept the challenge and even take control of William's kingdom because they were unhappy with how the kingdom was being run. These barons ask......middle sheet......int.IBIDIBIDC. H. B. Quennell. The Bell Cathedrals Project Gutenberg EBook: Norwich Cathedral Church. Chapter 1 Sample Matt. Heroes of history: heroes of the common people. View 9001Allen Brown, Reginald. English Castles by Allen Brown, Woodbridge: The Boydell Press, ISBN 1-84383-069-8Clark, George Thomas. “The Castles of England and Wales in the Latter Part of the Twelfth Century,” The Archaeological Journal 38: 258–276, 335–351 Norwich Castle. Museum and Art GalleryHistory of Norwich CastleBBC News. BBC and Web. 20 April 2014.• "A History of Norwich Castle". Norfolk Museums Service -. Np, nd Web. 01 Apr 2014.• “Norwich Castle.” UK Travel and Heritage. Np, nd Web. 01 April 2014.• “Norwich Castle”. Norwich Castle. Np, nd Web. 01 April. 2014.• “History of the City of Norwich”. Information about Norwich. Np, nd Web. 01 April. 2014