It was thought to have built by King Offa in the 8th century as border between England and Wales But even though it has been part of the British landscape for centuries, the ancient Offa's Dyke may have to be renamed, after archaeologists discovered it could have been completed 200 years before the great Anglo Saxon leader was born. Experts used radiocarbon dating on the 177-mile dyke and revealed it could have been constructed as early as the 4th century... The group behind the project said it is a 'tremendously exciting discovery' which challenges the accepted history of the ancient...