Antique print titled 'Longford Castle the Seat of the Earl of Radnor in Wiltshire'. Large engraving of Longford Castle, Wiltshire. Source unknown, to be determined. Artists and Engravers: Engraved by Miller. Longford Castle stands on the banks of the River Avon south of Salisbury, Wiltshire, England. It is the seat of the Earl of Radnor,[1] and an example of the Elizabethan prodigy house. Condition: Good, general age-related toning. Blank verso, minor wear and defects. Please study image carefully. Date: 1766 Overall size: 76 x 57 cm. Image size: 55 x 33 cm.