Princess Diana has stayed in the cultural zeitgeist in the 24 years since her death.
A feature of all of those productions is the focus on Diana’s personal life.
Princess Diana and Prince Charles separated in 1992 and formally divorced in 1996 (fromHistory).

During their marriage, Prince Charles continued his affair withCamilla Parker-Bowles, and Princess Diana met James Hewitt.
In “The Crown,” the relationship between Hewitt and Diana is mentioned (viaInsider).
Diana called it filled with “a lot of fantasy” but also said she adored and loved Hewitt.

But the timing just doesn’t line up for that to be true.
Hewitt has publicly said that he is not Harry’s father (fromMarie Claire).
Because [‘The Crown’] is obviously fiction, take it how you will" (viaDeadline).