In a signed message he wrote: "In marking the first anniversary of her late majesty's death and my accession, we recall with great affection her long life, devoted service and all she meant to so many of us.
"I am deeply grateful, too, for the love and support that has been shown to my wife and myself during this year as we do our utmost to be of service to you all."
To mark the anniversary, he released one of his favourite official portraits of the late queen, captured at Buckingham Palace on 16 October 1968 as part of an official sitting granted to Cecil Beaton.
The image, which shows a 42-year-old Elizabeth wearing her Order of the Garter star, was first shown at the National Portrait Gallery between November 1968 and March 1969. Beaton first photographed the late queen in 1942, and continued to photograph her and other members of the royal family, but the 1968 sitting was their final sitting together.
The king and queen will mark the anniversary at their Scottish retreat, where they are spending their traditional summer break.
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