Ampthill Park and Ampthill House is a country estate in Ampthill, Bedfordshire, England. The park was opened to the public after the Second World War . From the 14th century Ampthill Park was a royal lodge and hunting park. In the 15th century it was occupied by Sir John Cornwall, who had married the king's sister, Elizabeth of Lancaster, Duchess of Exeter. Sir John amassed a large fortune and constructed Ampthill castle, a fortified house. After his death Ampthill Park passed to Edmund Grey, 1st Earl of Kent before becoming royal property again. Henry VIII used it for hunting and to hold Katherine of Aragon during the annulment of their marriage. By 1600 the castle was ruinous and in 1661 the park was given by Charles II to John Ashburnham, a Royalist supporter.