Prince William’s role at his father’s coronation has been revealed — but Prince Harry’s remains a mystery.

After the Archbishop of Canterbury pledges his allegiance to King Charles III on Saturday, the Prince of Wales will follow suit, according to the Liturgy of the Coronation Service.

Prince William will kneel before his father, who will already have been crowned, and place his hands between the king’s and recite the Homage of Royal Blood:

“I, William, Prince of Wales, pledge my loyalty to you and faith and truth I will bear unto you, as your liege man of life and limb. So help me God.”

William, 40, is the only member of the royal family who will honor King Charles in speaking capacity during the ceremony.

A role for Harry in the coronation was not included in the Liturgy — and has yet to be revealed.

Buckingham Palace previously confirmed that the Duke of Sussex, 38, would attend the coronation, but without wife Meghan Markle and their kids.

Instead, the Duchess of Sussex will remain in Montecito, Calif., to celebrate her son Archie’s 4th birthday.

“There was no way that Meghan was going to miss her son’s birthday,” a source shared with us.

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Prince Archie and Princess Lilibet only recently had their titles updated on the line of succession, prompting one highly placed source to tell us that “it is a shame” that Archie and Lilibet — nicknamed Lili — will not be in attendance on “such a historic occasion.”

We’ve also learned that redhead royal will return to the US to attend his son’s birthday party immediately after the coronation.

Despite her absence from the historic event — which has drawn severe criticism — Markle, 41, still made the cut for the coronation souvenir program.

“No one in their right mind believes Hollywood Meghan Markle is passing up a chance to peacock in front of the world to blow up balloons and serve cake in the backyard,” Meghan McCain wrote of Markle in the Daily Mail.

“No matter how tone-deaf she is (and she’s pretty tone-deaf), she must be aware of how deeply unpopular she is in her husband’s home country,” she added. “She would likely be booed the second the private jet’s wheels touch down.”