Meghan Markle ‘deepened’ royal rift as ‘doing good wasn’t enough – she wanted to change the world’, biography claims

, the speed at the breakdown of the family relations was revealed - including allegations of Meghan's impact.

Author Robert Lacey claimed: "So here was another profound reason for the rift that would divide William and Harry and come close to shattering the House of Windsor within two years.

"Meghan didn't just want to do good in the world — she wanted to change the world."

And while it was claimed Kate Middleton and Meghan treated each other with "mutual respect" - it was Prince Harry and William who would "never hesitate" to argue, the new book claimed today.

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Battle of Brothers also claims...

• Prince William enraged Harry by asking uncle to stop him rushing into marriage with Meghan
• Meghan Markle and Kate Middleton treated each other with 'mutual respect'
• Prince Harry had a 'classic explosion' after butting heads with Prince William
• Harry's ex Cressida Bonas thought he was 'damaged and self-obsessed'

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The duchesses were "cool professionals" - with the explosive Battle of Brothers claiming friction between the couples had instead flared when Prince William flagged concerns over the speed of Meghan and Harry's relationship.

It was claimed the duchess had "got on rather well" from the start.

Author Robert Lacey claimed: "They might not be best-buddy material, but they found themselves, sister-outsiders in their extraordinary royal situation, and both of them cool professionals, treating each other with mutual respect.

"Each was far too canny to make an enemy of a prospective sister-in-law - it only made sense to be friends."

Instead, the author claimed the "fundamental conflict" was between Harry, 36, and William, 38, as they had "never hesitated to tell each other exactly what they thought and felt".

A number of friends reportedly told the author that William questioned his younger brother over his romance with Meghan.

And William was so concerned that he went to his uncle Charles Spencer, the brother of Princess Diana, for help, it was claimed.

But the move angered Harry - who was alleged to have become furious with the future king for dragging other family members into the row.

According to Battle Of The Brothers the tiff led to the brother’s continuing “fraternal fissure”.

Among William's frustrations were claims that Harry and Meghan had given the palace just ten minutes' notice over their announcement to quit the Royal Family.

Wills was distraught when they announced in January they were quitting for a life in Canada.

And while he reportedly agreed to keep things civil at the Sandringham Summit, which hammered out the first details of the Megxit deal, he was unwilling to go any further, according to the book.

The author also claimed the couples had been "good actors" during their first appearance together at a Royal Foundation Forum in early 2018.

When quizzed over if the family had disagreements, Prince William replied "yes" while Harry described them as "healthy".

The younger prince then admitted disagreements came "so thick and fast".

Meghan and Harry are now living in the US after quitting the Royal Family earlier this year.

The couple, who bought a home in Santa Barbara, have started charity works while living there with baby Archie.

Meanwhile, Kate and William have started to conduct in person royal engagements in the UK after the coronavirus lockdown.