For decades, the two have remained side by side through the ups and downs.

Charles is visiting Australia in his first trip to overseas realms since becoming king.

King Charles III's coronation will take place at Westminster Abbey on May 6.

The Crown Estate and Duchy of Cornwall Estate released their annual reports.

In a grand ceremony to mark the start of a new Parliament, King Charles delivered a speech, addressing the House of Commons with the laws the new government plans to set.

Activists with Animal Rising said they "redecorated" the painting on Tuesday.

Charles unveiled the portrait himself at Buckingham Palace.

Prince William is now the Colonel-in-Chief of the Army Air Corps.

Charles' cancer diagnosis was announced in February by Buckingham Palace.

Buckingham Palace announced Charles' cancer diagnosis back in February.

The room off Buckingham Palace's famous balcony will now be accessible to the public.

New photos show King Charles III reading some of the thousands of cards he received following his cancer diagnosis.

Harry spoke to "GMA" about his family and the 2025 Invictus Games.

King Charles III has made his first public appearance since Buckingham Palace announced he was diagnosed with cancer.

Harry described tensions with his father and brother in his memoir "Spare."

King Charles III became king in 2022. His recent cancer diagnosis has raised questions about what happens in the event of his death or abdication.

Both Princess Kate and King Charles III are facing health issues.

U.K. Prime Minister Rishi Sunak said Tuesday that King Charles III's cancer was "caught early" and he would "continue to communicate with him as normal."

King Charles III is the oldest child of Queen Elizabeth II, whom he succeeded.

King Charles III, 75, has cancer, Buckingham Palace announced on Monday.

King Charles III, 75, was treated for an enlarged prostate and is currently recovering, according to Buckingham Palace.

King Charles III has arrived at a London hospital for scheduled treatment this morning, according to a statement released by Buckingham Palace.

King Charles will undergo a procedure next week to be treated for an enlarged prostate, according to Buckingham Palace.

King Charles III also remembered his mother Queen Elizabeth II for "all she meant to so many of us" on the first anniversary of her death.

This year's Trooping the Colour is the first of King Charles' reign.

London was Biden’s first stop ahead of his trip to Vilnius, Lithuania for the 74th NATO summit.

Louis, 5, showed his personality once again at the historic event.

Here are some of the biggest highlights from the ceremony celebrating the new monarch.

More familiar faces showed up to attend the ceremony celebrating Charles as the new monarch

The coronation will take place in London on Saturday, May 6.

Anti-monarchists are expected to stage large-scale protests in London on Saturday during the coronation of Britain's King Charles III.

The Princess of Wales mingled with world leaders at a reception for King Charles III, ahead of the coronation.

Prince Harry will attend the coronation in England on his own.

As king, Charles is the sovereign of 56 Commonwealth countries.

In the darkness of the early morning, the coronation procession dress rehearsal took place. Later, members of the royal family later gathered at Westminster Abbey.

Elizabeth had become queen in 1952 on the death of her father.

Duchess Meghan and their two children will not attend the coronation.

King Charles III wants to protect the planet for future generations -- a passion he has highlighted throughout his decades as monarch-in-waiting.

Princess Diana's former secretary Patrick Jephson is speaking out ahead of King Charles III's coronation.

Tom Parker Bowles shared his reaction to his mom becoming queen.