Burh
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A Burh is an Anglo-Saxon name for a fortified town or other defended site, such as a hill fort. The boundaries of ancient burhs can often still be traced to modern urban borough limits. A 10th century document called the Burghal Hidage cites 33 burhs in Wessex, built to defend the region against Viking raids. Most of these were founded by Alfred the Great, some based on pre-existing Roman structures, some newly built, though some may have been built later. Athelstan granted these burhs the right to mint coinage. The largest were at Winchester, Wallingford and Warwick, and Wallingford and Wareham are the best preserved examples, with substantial ditches and banks still visible. It has been estimated that construction of Wallingford's 9,000 feet of bank would have taken more than 120,000 man hours, and have required 2,400 men to maintain. Burh towns also usually had regular street layouts, some of which are also preserved.