in 1825, the three castles were sold off to henry somerset, the duke of beaufort. in 1902, henry somerset, the 9th duke, sold white castle to sir henry mather jackson. evidence was given to the royal commission on ancient monuments in wales and monmouthshire in 1909, stating that sir henry had taken steps to strip the castle of ivy and that it was now in a good condition; the site was apparently looked after by an old woman, who charged visitors for entry. the castle was placed into the care of the state in 1922. in the 21st century, white castle is managed by the welsh heritage agency cadw and is protected under uk law as a grade i listed building.