The Queen found the run-up to Prince Harry and Meghan Markle 's wedding "very difficult", a distant relative of Her Majesty claimed according to a new book.
The late Queen Elizabeth II was also said to be "very upset" by how her grandson had treated her, it was further alleged.
Some of the highly-publicised details about the run-up to the 2018 wedding have included an alleged argument between Meghan and Kate Middleton over the bridesmaid's dresses.
There was also reportedly a row over what tiara the bride was going to borrow.
Katie Nicholl's new book The New Royals: Queen Elizabeth's Legacy and the Future of the Crown alleges that Harry told his grandmother's long-time dresser: "What Meghan wants, Meghan gets!"
This then reportedly prompted a telling-off from his grandmother.
The book goes on to quote Lady Elizabeth Anson, the late Queen's first cousin once removed.
Lady Anson, who died in 2020, is quoted as saying: "The run-up to the wedding was really very difficult for the Queen.
"She was very upset by how Harry had behaved and some of his demands and the way he went about things in his own way.
"For example, he asked the archbishop of Canterbury to marry them before consulting the Queen and the Dean of Windsor, which wasn't the correct way to do things.
"I think she was dismayed by his attitude in general and I remember her speaking to him and her being rather upset by how beastly Harry was being.
"Their relationship was quite badly damaged by it all."
The book has also alleged that the Queen was "exhausted" by the decision of Harry and Meghan stepping down from the firm.
It claims the late Queen Elizabeth II confided to a close friend that she was exhausted by the decision.
The source said: “She was very hurt and told me, ‘I don’t know, I don’t care, and I don’t want to think about it anymore.”
The book goes on to claim that the 96-year-old monarch saw very little of her great-grandchildren Archie and Lilibet.