In a leaked extract, it is alleged that the Prince of Wales grabbed his brother and ripped his necklace before knocking him to the floor.
Harry goes on to claim that William had called the American actress “difficult”, “rude” and “abrasive”.
“It all happened so fast. So very fast. He grabbed me by the collar, ripping my necklace, and he knocked me to the floor. I landed on the dog’s bowl, which cracked under my back, the pieces cutting into me,” Harry reportedly wrote in the book.
“I lay there for a moment, dazed, then got to my feet and told him to get out,” the excerpt continued.
The incident allegedly took place at Nottingham Cottage back in 2019 when Harry was living there and started when William arrived and complained about Meghan.
Sky News has approached Buckingham Palace for a comment.
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‘You don’t need to tell Meg about this’
Harry writes that his brother was not being rational and they both started shouting at each other, exchanging insults, before William claimed he was trying to help.
“Are you serious? Help me? Sorry – is that what you call this? Helping me?,” Harry said, according to The Guardian’s copy.
His comment supposedly angered William, and the alleged altercation took place after he offered him a glass of water.
Harry added that William urged him to hit back, before leaving and then returning “looking regretful and apologised”.
When he left again, Harry said he “turned and called back: ‘You don’t need to tell Meg about this”.
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2:23
Royals braced for Prince Harry book
Harry told his therapist about the incident first
He goes on to explain that he didn’t immediately tell his wife, but did tell her of the incident after she noticed “scrapes and bruises” on his back.
However, he claimed to have told his therapist first.
The book, which is entitled after the phrase ‘heir and a spare’, also delves into Harry’s childhood, his school, his career as a royal and the relationship he shares with his parents and brother.
He recounts memories of his mother, Princess Diana, who was killed in a car crash in 1997, and for the Queen, who died last year.
Spare, which is due to be released on 10 January, comes after the prince’s recent Netflix documentary into his life with Meghan and their decision to leave the royal family.
In the series, it was revealed Meghan suffered a miscarriage, which Harry said was caused by the stress put on her as a result of their lawsuit against the Daily Mail’s parent company, and had suicidal thoughts.
He also claimed that William broke a promise to him never to leak stories or brief against one another after witnessing the fallout of such actions in their father’s office.
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Harry and Meghan: Key takeaways
‘I want a family – not an institution’
The duke’s extraordinary book claims come after the release of a teaser trailer from an ITV interview in which Harry said he wants his father and brother back.
The interview, due to be released on Sunday, will be broadcast two days before Spare is published around the world.
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2:07
Prince Harry wants his father ‘back’
In a series of clips from his ITV conversation, Harry tells presenter Tom Bradby: “It never needed to be this way”, and refers to “the leaking and the planting” before adding: “I want a family, not an institution.”
But in a separate interview with CBS News, set to air the same day, Harry also criticises Buckingham Palace over an alleged failure to defend him and the Duchess of Sussex, before they stepped down as senior royals.
The duke also reveals to the US broadcaster that he would not return to the institution as a full-time royal.