Offa's Dyke, England

Offa's Dyke, England [Si].
A very substantial linear earthwork believed to have been built by King OFFA of Mercia in the 8th century ad as a frontier between his kingdom and the lands to the west. The earthwork comprises a large bank to the east and a ditch to the west. It runs for more than 192km from Treuddy in the north to Chepstow in the south, close to the modern border of England and Wales. Studies by Sir Cyril Fox and others, however, show that it is not a single earthwork but rather a series of constructions joined together and in some places running roughly parallel to each other.[Rep.: C. Fox, 1955, Offa's Dyke. London: British Academy]