Beech Bottom Dyke
Beech Bottom Dyke, is a large ditch running for almost a mile at the northern edge of St Albans, Hertfordshire flanked by banks on both sides. It is up to 30 m (98 ft) wide, and 10 m (33 ft) deep, and it can be followed for three quarters of a mile between the "Ancient Briton Crossroads" on the St Albans to Harpenden road until it is crossed by the Thameslink/Midland mainline railway at Sandridge. Beyond the railway embankment it continues, to finish just short of the St Albans to Sandridge road. This part is not accessible to the public.
It was constructed towards the end of the Iron Age, probably between 5 and 40 AD. This, and other similar earthworks in the district, may have been built by the powerful Celtic tribe established in this area, the Catuvellauni, probably by King Cunobelinus to define areas of land around their tribal centre at Verlamion - the predecessor of the Roman city of Verulamium.
Beech Bottom Dyke is thought[by whom?] to have originally been part of a defensive system for a Belgaic settlement. Other defences are the Devil's Dyke and another ancient earthwork known as "The Slad". These may have created a defensive earthwork running from the River Lea to the River Ver enclosing a very large area).
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