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Her post-marriage style was listed as "HRH Princess Katherine, Lady Brandram". I've corrected this to "The Lady Katherine Brandram", since her husband was (so far as I can tell) neither Sir Richard nor Lord Brandram, so she was not entitled to be "Lady Brandram". She was granted the style of a duke's daughter, i.e. "The Lady Katherine Brandram". Her foreign style would have been something like "HRH Princess Katherine, Mrs Richard Brandram". ✝DBD 17:04, 15 May 2011 (UTC)
When she married she was given by the King of the UK the title of a Dukes daughter, she was known as such abroad. After her marriage she did not use the Title Royal Highness. — Preceding unsigned comment added by 18.104.22.168 (talk) 17:34, 2 September 2012 (UTC)