Princess Diana (1961-1997) was the wife of Prince Charles from 1981 until 1996.
Portrayal on the show
Most of the jokes about her were about her numerous appointments to the hairdresser, her "Slone ranger" persona and her reclusive famous lifestyle within Buckingham Palace. In the later seasons, she was seen as a wife who loved her husband even though she didn't care much for her. Following their divorce, her character was rarely seen in the show up to its cancellation in 1996 a year before her actual death from a car crash in Paris in 1997.