At the Battle of Beran Byrig or Beranburh the West Saxons are said to have defeated the Britons at Barbury Castle hillfort near Swindon in or around 556 AD according to the Anglo-Saxon Chronicle.
556: This year Cynric and Ceawlin fought with the Britons at Beran byrg.
The control of Barbury Castle and its surroundings is likely to have been strategically important for both sides, as it lies on the Ridgeway, a principal regional communication route.
The site of Battle of Beran Byrig lies on White Chalk Subgroup, bedrock that formed in the Maastrichtian. The rock here is chalk.
This page covers Battle of Beran Byrig. A full Aubrey report for the area pulls together this battle alongside scheduled monuments and everything else the record holds within a few miles:
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