The Duke of Sussex claimed that there was a “temptation or urge” for royal men to marry someone who “would fit the mould” in his explosive Netflix documentary.

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In the Netflix series, Harry said: “I think for so many people in the family, especially the men, there could be a temptation or an urge to marry someone who would fit the mould as opposed to someone you are destined to be with.

“The difference between making a decision with your head or your heart.”

But his comments – which could be perceived as a jibe at his brother’s wife Princess Kate – reportedly left Wills fuming.

Royal expert Robert Hardman claims in his new biography: ‘Charles III: New King, New Court. The Inside Story’ that William believed the comments were “the lowest of the low”, according to a friend.

They said: “On top of all the other breaches of trust, here was Harry making a blatant attack on Catherine.”

Mr Hardman wrote how The Firm was divided on whether this was a “calculated slight” against Kate or another case of “Harry shooting his mouth off”.

The Netflix salvo joins a number of “casual betrayals” contained within the Duke’s memoir Spare, the book has claimed.

William is said to be “mortified” over how the book shared fraternal secrets of the pair, including one incident where he is alleged to have attacked Harry.

Mr Hardman’s book – serialised in the Daily Mail – claimed neither King Charles or William have read Spare but they’ve been briefed on key points.

But while the King feels “exasperated” by Harry, he is too preoccupied with Royal duties to dwell on it, according to a friend.

The book has made a number of other allegations.

QUEEN’S ‘FURY’

Among them is how Queen Elizabeth was left “angry” over the Sussexes’ claim she gave them permission to name their daughter Lilibet.

Harry and Meghan said publicly they would not have used Her Majesty’s private nickname if she had not been “supportive”

But one member of her staff has told how that comment left the late Monarch “as angry as I’d ever seen her”.

As a child, Her Majesty used to say ‘Lilibet’ because she couldn’t pronounce Elizabeth.

It soon became a beloved nickname, used only by close family members including her parents and husband Prince Philip.

The Archewell announcement of Lilibet’s birth read: “Lili is named after her great-grandmother, Her Majesty The Queen, whose family nickname is Lilibet.”

But reports soon emerged claiming the pair never sought permission from the Queen to name their daughter after her.

Harry, 39, and Meghan, 42, later such claims were false, defamatory and should not be repeated.

They said at the time: “The duke spoke with his family in advance of the announcement – in fact his grandmother was the first family member he called.

“During that conversation, he shared their hope of naming their daughter Lilibet in her honour.

“Had she not been supportive, they would not have used the name.”

But when the Sussexes asked Buckingham Palace to “prop up” their version of events, they were “rebuffed”, the book claimed.

The book also alleged King Charles did not dine with Harry on the night Queen Elizabeth died.

It claimed The King needed to have “discreet discussions” with William before he could be expected to “console the whole country”.

Charles III: New King. New Court. The Inside Story by Robert Hardman, is out in hardback on January 18, published by Macmillan.