AceShowbiz - More details about Prince Harry and Prince William's alleged fallout has emerged online. In his new book titled "Battle of Brothers: The Inside Story of a Family in Tumult", historian Robert Lacey claimed the two had a "fierce and bitter" argument over Meghan's bullying claims.

The author noted that  William and Harry's fallout started when William had alleged doubts about how quickly Harry moved with his then-girlfriend Meghan. In new excerpts, which were obtained by The Times newspaper, it was said that while the pair's relationship got better by the time of Harry and Meghan's May 2018 wedding, it got worse in October 2018 when a senior palace aide accused Meghan of bullying staffers.

William reportedly confronted his younger brothers after learning the claims and led them to a "fierce and bitter" argument. That prompted the Duke of Cambridge to remove the Sussexes from the joint office, or household, they shared. "William threw Harry out," a friend told Robert.

Describing the confrontration, Robert claimed that it was first done over the phone but then they argued in person. "When Harry flared up in furious defense of his wife, the elder brother persisted," reads an excerpt. "Harry shut off his phone angrily, so William went to speak to him personally. The prince was horrified by what he had just been told about Meghan's alleged behavior, and he wanted to hear what Harry had to say. The showdown between the brothers was fierce and bitter."

As for William's wife Kate Middleton, she reportedly had been "wary of [Meghan] from the start." The Duchess of Cambridge allegedly says that William told a friend he thought she had an "agenda" and the bullying allegations apparently backed his initial reservations.

"Both brothers have been damaged by their upbringings; both have reacted by finding different solutions," the author, who is also the historical consultant for Netflix's "The Crown", said. "There is so much pain and trauma in this story, going right back to the beginning."