Queen Elizabeth II was not officially informed for nearly a decade that Anthony Blunt was a Soviet spy, newly declassified documents reveal.

Queen Elizabeth II wasn’t told details of her long-time art adviser’s double life as a Soviet spy because palace officials didn’t want to add to her worries, newly declassified documents reveal.

Queen Elizabeth II was not told officially for nearly a decade that one of her most senior courtiers had admitted he was a Soviet spy, newly declassified British files revealed Tuesday.

Anthony Blunt, who worked at Buckingham Palace as Surveyor of the Queen’s Pictures, was secretly a Soviet spy during WWII.

Members of the spy ring in the 1930s spilled secrets to the Soviet Union from the heart of the U.K. intelligence establishment.

Newly released documents from British intelligence reveal new secrets about the late queen’s former art adviser.