The castle was built in 1145 by King Stephen. At the time there was civil war between himself and his cousin Matilda, whose headquarters were at nearby Wallingford Castle. In 1153 the castle was destroyed by Matilda's son, who later became Henry II.
A manor house now stands on the site.
- Brightwell Castle
- Fry, Plantagenet Somerset, The David & Charles Book of Castles, David & Charles, 1980. ISBN 0-7153-7976-3
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