In a heartfelt letter, Princess Catherine, the Princess of Wales, has apologized for missing a key rehearsal for this year’s Trooping the Colour ceremony. The absence comes as the Princess continues her recovery from cancer treatment.

The letter, addressed to the Irish Guards regiment of which she is Colonel, conveys the Princess’s deep regret at being unable to take the salute during the Colonel’s Review on Saturday. This event serves as the final practice session for the Trooping the Colour parade, celebrating King Charles III’s birthday on June 15th.

A video posted by the Irish Guards on social media showcased the letter being read to the troops. The caption expressed the regiment’s deep appreciation for the Princess’s message.

In her own words, the Princess wrote:

“I wanted to express my immense pride in the entire regiment as you prepare for the Colonel’s Review and Trooping the Colour. I understand the countless hours dedicated to practice by everyone involved this year, ensuring immaculate uniforms and drill execution.

Being your Colonel remains a great honor, and I am truly sorry that I cannot take the salute at this year’s Colonel’s Review. Please extend my sincerest apologies to the entire regiment. I sincerely hope to represent you all again very soon.

Sending my warmest wishes and best of luck to all involved.”

The letter concludes with the motto “Quis Separabit,” meaning “Who will separate us?” in Latin. This phrase, derived from the Bible, holds significance for the British Army in Ireland.

While it remains unclear whether the Princess will attend the main Trooping the Colour event next week, traditionally held on the sovereign’s birthday, she will be represented at the Colonel’s Review by General James Bucknall. He will act as the chief inspecting officer in her absence.

Earlier in March, the royal family had requested privacy and time for their family as the Princess underwent treatment for an undisclosed form of cancer.

During a visit to the Isles of Scilly in May, the Prince of Wales offered a positive update on his wife’s condition. When questioned by a hospital administrator, he reassured them that “she’s doing well.”

The Trooping the Colour ceremony typically involves the King reviewing the Guardsmen and officers from an Ascot Landau carriage alongside the Queen, held on Horse Guards Parade in Whitehall. Last year, however, then-Prince Charles inspected the troops on horseback.

This change in tradition reflects Buckingham Palace’s earlier pronouncements that all future engagements for the King will be carefully considered, with adaptations made based on medical advice. The King is expected to be accompanied by the Queen in a carriage during the traditional procession, and to watch the ceremony itself from a seated position on a dais rather than on horseback.