Chastleton House is a Jacobean country house at Chastleton, Oxfordshire, England, close to Moreton-in-Marsh. It has been owned by the National Trust since 1991 and is a Grade I listed building. Chastleton House was built between 1607 and 1612, possibly by Robert Smythson, for Walter Jones, who had made his fortune from the law, although his family w…Chastleton House is a Jacobean country house at Chastleton, Oxfordshire, England, close to Moreton-in-Marsh. It has been owned by the National Trust since 1991 and is a Grade I listed building. Chastleton House was built between 1607 and 1612, possibly by Robert Smythson, for Walter Jones, who had made his fortune from the law, although his family were originally Welsh wool merchants. The estate was bought in 1602 from Robert Catesby, although his residence was demolished to make way for the new house and no traces of the original building on this spot remain. The house is built of Cotswold stone, around a small courtyard, called the Dairy Court.