Prince Harry is reportedly demanding an apology from the Royal Family for the manner he was treated at Queen Elizabeth II's Platinum Jubilee.

The Duke of Sussex is "extremely enraged," according to royal biographer Angela Levin.

She alleges, according to The Sun, that he didn't thought to check Prince William's schedule before flying back home with Meghan Markle and their two children, Lilibet Diana and Archie Harrison.

"I believe he would have been irritated that he was mainly neglected. He still believes he owes an apology."

It has also been established that the once-close Princes did not meet privately during the four-day celebrations.

Prince Harry and Meghan Markle did, however, meet with the Queen, however their request for a photograph of Her Majesty with Lilibet was denied.

The Sussexes are also said to have met with Prince Charles and Camilla, Duchess of Cornwall.

However, Levin clarified that it is not the royal family's responsibility to apologize to the royal family.

"He indicated during the Oprah interview that Charles and William were stuck; he said his father had cut him off," she told the site.

"You can't just go about being disrespectful to people and expect them to open up to you again."

The Sussexes were snubbed by Prince William and Kate Middleton.

Lilibet Diana celebrated her first birthday with Prince Harry and Meghan Markle at Frogmore Cottage in Windsor, bringing her relatives for picnic cuisine and party activities.

They even invited Prince William and Kate Middleton's children, who apparently did not attend.

There's a reason they weren't able to attend Lilibet's birthday party, according to Angelina Levin.

"They didn't bother to find out the Cambridges would be in Wales in the morning and returning to prepare for the Jubilee concert in the afternoon, so they couldn't go."

READ ALSO: Why No Photos of Queen Elizabeth II, Lilibet Diana Were Released After Private Meeting


Prince Harry and Meghan Markle at Queen's Platinum Jubilee

Prince Harry and Meghan Markle only attended one Jubilee event in public, a thanksgiving ceremony at St. Paul's Cathedral.

During the occasion, they sat in the second row, far away from Prince William and Kate Middleton's aisle.

At the occasion, neither couple acknowledged the other nor made eye contact.

"The thing that jumped out for me on that day was Harry's wrath - he wears his emotions on his face, and he looked furious," Angela Levin said of the Sussex.

"I think it's fascinating - he may have been feeling a variety of emotions. I'm not sure whether he felt any emotion at what he'd given up."

READ MORE: Queen Elizabeth II Body Language at the End of Platinum Jubilee Showed True Self, Expert Says