Anti-monarchy group Republic protested inside the grounds of Windsor Castle today.
The group posted a photograph on social media of two of their members holding up a banner with the words 'End Royal Secrecy' displayed.
The protest took place during the public opening hours and the protesters were paying ticket holders.
The Royal Collection Trust, who organises public tours of occupied royal residences, declined to comment on security matters.
Anti-monarchy group Republic protested inside the grounds of Windsor Castle today.
PA
Republic wrote on social media: "Republic activists have just protested INSIDE Windsor Castle, demanding an end to royal secrecy.
"It's simple - end royal secrecy, end the monarchy."
Republic have also set up an appeal titled the Royal Secrets Appeal.
The organisation has set a target of £300,000 to be raised by donations.
The current total stands at just less than £2,000 at the time of writing.
On their appeal page, Republic claims: "The royals are secretive. Very secretive."
King Charles is not currently staying at Windsor Castle.
The monarch met with Prime Minister Rishi Sunak at Buckingham Palace on Wednesday.
The meeting was their first face-to-face conversation since the King was diagnosed with cancer.
King Charles and Sunak had been holding their weekly meetings over the phone since the diagnosis.
King Charles and Sunak had been holding their weekly meetings over the phone since the diagnosis.
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Republic protested during King Charles and Queen Camilla's Coronation.
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The monarch had been staying at Sandringham following his first round of cancer treatment.
The Palace has not released any details surrounding what type of cancer the King has other than confirming it is not prostate cancer.
King Charles was coronated on May 6 2023 alongside his wife Queen Camilla.
Republic protested outside Buckingham Palace following the King's Coronation.
