Britain's King Charles will miss next week's engagements to mark Commonwealth Day, Buckingham Palace said on Tuesday, with his wife Queen Camilla stepping in for the monarch as he continues to undergo treatment for cancer.
King Charles, 75, has been forced to step away from public duties after it was announced last month he had been diagnosed with a unspecified form of cancer, less than 18 months into his reign.
As a result, the king, who is head of the Commonwealth of 56 countries that evolved from the British Empire, will be unable to attend the annual service of celebration at Westminster Abbey on Monday and a reception afterwards.
Queen Camilla will head the group of senior royals in attendance, which will include heir-to-the throne Prince William but not his wife Kate Middleton, who has also been absent from public life this year after having abdominal surgery for a non-cancer related ailment.
While King Charles is keeping up with his official state duties and was pictured on Tuesday meeting finance minister Jeremy Hunt a day before he gives his budget statement to parliament, it is not clear when he will return to his usual public role.
The absence of both the king and Kate Middleton, while Prince William missed an engagement last week because of an unspecified "personal matter", has led to a surge of speculation and conspiracy theories on social media.
The British royals rarely release details of any medical conditions, regarding them as purely private matters, but the policy of maintaining a dignified silence on rumours is coming under pressure.
"The most cursory of glances at the rampant speculation on social media ought to Âpersuade even the most unyielding of royal aides that wherever there is a vacuum Âsurrounding a public figure, it will be filled," royal expert Richard Kay wrote in the Daily Mail newspaper.
Kate Middleton's office has said it would only provide "significant" updates on her condition, and that she was not expected to be back performing public duties until after Easter.
Britain's Ministry of Defence said on Tuesday she would be attending an annual military parade in June. However Kensington Palace is responsible for confirming her attendance at future events and has not yet done so.
It comes the day after US celebrity news site TMZ published what it said was the first picture of the Princess of Wales since her operation in January, sitting in the passenger seat of a car driven by her mother near Windsor Castle.
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