British media reported that Prince Harry arrived at the residence of his father King Charles III in London today, Tuesday, a day after the king announced he was diagnosed with cancer.

The youngest son of the king was filmed driving his car to Clarence House, near Buckingham Palace, after flying from Los Angeles to London.

The two have a troubled relationship, after Harry resigned from his royal duties in 2020, moved to California with his wife Meghan, and royal officials announced on Monday that the 75-year-old king was diagnosed with an unspecified type of cancer and is receiving treatment.

The news shocked the nation, and Prime Minister Rishi Sunak said the illness was detected early and the entire country hopes for a speedy recovery.

Buckingham Palace announced on Monday evening that the king had begun outpatient treatment for an unspecified type of cancer. The palace said it was discovered during his recent treatment in hospital for an enlarged prostate, but it is a "separate issue" and not prostate cancer.

Sunak told BBC Radio: "Fortunately, this was discovered early," adding that as Prime Minister "he will continue to communicate with him as usual."

Sunak said: "Many families across the country listening to this have been affected by the same thing and they know what it means for everyone." "So we will be eager for his join us and hope to get through this as soon as possible."

Less than 18 months after ascending the throne, which he waited decades for, the 75-year-old king suspended his public engagements, but will continue state business - including weekly meetings with the Prime Minister - and will not, therefore, hand over his constitutional duties as head of state.

The palace said Charles, who is generally in good health, "remains entirely positive about his treatment and looks forward to returning to full public service as soon as possible."

Charles became king in September 2022 when his mother Queen Elizabeth II died at the age of 96 after 70 years on the throne.

The news of the king's diagnosis comes as his son's wife Kate, Princess of Wales, recovers from abdominal surgery that led to her hospitalization for nearly two weeks.

Kate is taking a break from her royal duties while recovering, and her husband Prince William, heir to the throne, took leave to help care for her and their three children, but is scheduled to preside over an event at Windsor Castle and a charity dinner on Wednesday.

Charles has broken from royal tradition by being open about his prostate condition. For centuries, the royal family remained committed to silence about health matters.

Revealing information about his cancer diagnosis - albeit in a limited way - is another departure from tradition.

When British monarchs held real power, news of illness was concealed for fear it would undermine their authority, and the tradition of secrecy continued after members of the royal family became constitutional figures.

The British public was not told that Charles’ grandfather, King George VI, had lung cancer before his death in February 1952 at the age of 56, and some historians claim the king himself was not informed he had a terminal illness.

In the later years of Elizabeth’s life, the public was only told that the queen was experiencing "mobility issues" when she began to withdraw from public appearances near the end of her life, and the cause of death was simply listed on the death certificate as "old age."

When and how much to reveal about illness remains a difficult subject for many public figures. U.S. Defense Secretary Lloyd Austin faced criticism for not informing President Joe Biden or other senior leaders that he was undergoing treatment for prostate cancer, even when he was admitted to a hospital intensive care unit in January due to post-surgical complications.

Buckingham Palace said the king "chose to share his diagnosis to prevent speculation and in the hope that it would help public understanding of all those affected by cancer worldwide."

Charles took the throne intending to lead a smaller monarchy with fewer senior members of the royal family performing ceremonial public duties. But with both Charles and Kate temporarily sidelined, Prince Harry self-exiled to California, and Prince Andrew largely out of sight due to his association with sex offender Jeffrey Epstein, the royal "company" faces the risk of severe burnout.

William’s and Charles’ wife, Queen Camilla, is expected to undertake more public engagements during the king’s treatment.

There are currently no plans to invite the "Councils of State" - senior members of the royal family, including the Queen and the heir to the throne - to deputize for the king in constitutional duties such as signing legislation and receiving ambassadors.