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History of Bran Ditch
The monument includes Bran Ditch, an Anglo-Saxon bank and ditch, c.5kms long, running from Black Peak in the north to Heydon in the south, as well as an associated Iron-Age enclosure at Black Peak, and a medieval lynchet north of Heydon village.
Bran Ditch is one of four parallel linear monuments, substantial ditches facing west with banks to the east, crossing the Cambridgeshire chalk plain from the springline and wetlands to the north to the junction of the chalk and boulder clay on the higher ground to the south. These monuments, generally referred to as the Cambridgeshire Dykes, increase considerably in scale from Bran Ditch to the west to Devils Dyke in the east, with Brent Ditch and Fleam Dyke in between: all are protected scheduled monuments, including the Bran Ditch.