Prince Andrew is said to have "lobbied very hard" to stop Charles becoming King, an explosive new royal book claims.
The Duke of York is alleged to have plotted with Princess Diana and ex-wife Sarah Ferguson to try and push Charles aside and stop him from taking the throne.
In an extract of Angela Levin's biography of Queen Consort Camilla published in The Telegraph, it's claimed a senior insider told her of Andrew's "treacherous request".
"He tried to persuade the Queen to block Charles marrying Camilla by being quite poisonous, mean, unhelpful and very nasty about Camilla," Levin writes.
"When Diana was alive, through her friendship with Andrew’s wife Sarah, [Duchess of York] she plotted with Andrew to try to push Prince Charles aside so Prince Andrew could become Regent to Prince William, who was then a teenager.
"They were dark and strange times, where paranoia became reality, and this was a worry. Andrew lobbied very hard with the hope that Charles would not become king when his mother died, and that William would wear the crown.
"His behaviour was very, very negative and extremely unpleasant to Queen [Elizabeth], who disagreed. I was told it was one of the rare occasions he didn't get his way.
"Nonetheless, he was apparently very angry that he couldn't rule the country in some way.
"He remained so hostile to Camilla’s emergence and acceptance that it's doubtful it has ever been forgiven," the insider is quoted as having said.
The disgraced Duke of York was forced to step back from royal duties after he was accused of sexually abusing Virginia Giuffre when she was a teenager.
That led to a disastrous interview with the BBC at Buckingham Palace in 2019, where he was questioned about his well-recorded relationship with sex offender Jeffrey Epstein.
Prince Andrew settled a lawsuit with Giuffre in February. He denied Giuffre's accusations that he forced her to have sex more than two decades ago at a London home of former Epstein associate Ghislaine Maxwell, and abused her at two Epstein properties. Giuffre, 38, was one of Epstein's and Maxwell's most prominent accusers.
As a result of the scandal, Prince Andrew lost his military links and royal patronages and would no longer be known as "His Royal Highness".