Richard de Vernon seigneur de Redvers, 1st feudal baron of Plympton in Devon, was a Norman nobleman who may have been one of the companions of William the Conqueror during the Norman conquest of England from 1066. His origins are obscure, but after acting as one of the principal supporters of Henry I in his struggle against his brother Robert Curthose for control of the English throne, de Redvers was rewarded with estates that made him one of the richest magnates in the country. He was once thought to have been created the first Earl of Devon, but this theory is now discounted in favour of his son Baldwin.

Carisbrooke Castle is a historic motte-and-bailey castle located in the village of Carisbrooke, Isle of Wight, England. Charles I was imprisoned at the castle in the months prior to his trial.