Prince Harry and Meghan Markle could become "very unhappy" and "insignificant", a royal author has warned.
Tom Quinn, who wrote the newly-released book Gilded Youth, has drawn similarities between the Duke and Duchess of Sussex and former King Edward VIII and his wife Wallis Simpson.
According to the expert, after sharing their experiences through interviews, books and documentaries, Harry and Meghan will not have much else to say - and the public will no longer be interested.
Mr Quinn said the Sussexes could face the same fate as Edward VIII and Wallis Simpson, whose intention to marry caused a constitutional crisis that forced the King to abdicate.
After marrying in France, they lived in a beautiful house but were "desperately unhappy", the author added.
Mr Quinn said Harry and Meghan risk a similar faith after stepping down as senior royals and opening up about the negative experiences they faced as part of the Firm.
The author told the Express : "When you're not saying that anymore, and you can't make any more films and interviews about how badly you've been treated, what then, what do you do?
"My fear is that Harry will become like Edward VIII and Meghan will become like Mrs Simpson."
He added: "They lived in this beautiful house in France, but we know they were desperately unhappy - Edward VIII was a bit like King Lear, where he gives away all his power, but somehow thinks he can still exercise power through his children. And I think Edward VIII, when he abdicated and went to live in France, thought he would still be an important figure.
"And he was for a little while, in the same way that Meghan and Harry are kind of significant now because there's so much coverage and commentary about them.
"But that will fade and, unless they can escape all this negative stuff and find something positive that people are interested in, they will become insignificant in the way that Edward VIII became insignificant and very unhappy."
Unlike Edward VII and his wife, Harry and Meghan are free to return to the UK without needing any permission from the monarch.
However, since moving to the US, they have only returned to the UK on some rare occasions both because of coronavirus restrictions which were brought in shortly after they left the country, and also because of safety concerns as the Sussexes no longer have taxpayer-funded security.
After stepping down as working members of the Royal Family, Harry and Meghan have opened up about the treatment they faced in a series of interviews and documentaries.
During an interview with Oprah Winfrey in March 2021, the pair revealed there had been "concerns" in the Royal Family over the colour of their son Archie's skin.
They also said Harry's father, who at the time was Prince Charles and became King in September 2022 following the death of Queen Elizabeth II, had stopped taking his calls.
Meghan also said she was suicidal but claimed the Palace did not allow her to get help.
Following the interview, they also released a Netflix documentary in which they shared more details about their lives as senior royals, as well as their new lives after moving to the US.
In January this year, Harry's book Spare, in which he shared his very public childhood, the death of his mum Diana, as well as his teenage struggles, was published.
