Means "Strong Dyke" in early English; this is the remains of a substantial earthworks built around 400-500AD by Anglo-Saxon settlers in Kent. It is a "V" shaped ditch or dyke, initially much deeper than what you can see here, the remains of which can be traced for around 1.5km along the current London-Kent border. It is thought the Kentish tribes were trying to stop the exodus of the last Romans from London, as the Roman Empire crumbled across Europe.
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