I get very cross sometimes when people continue to make stupid mistakes, even when they know they are wrong. Here are just a few:
Diana Spencer died at the age of 36. At no time in her life was she ever “Princess Diana”.
She was “Lady Diana Spencer” for a time before she married, then became “Her Royal Highness Diana, Princess of Wales”. After she died, as a courtesy title only, she was known as just “Diana, Princess of Wales”.