Prince William has written an honest and moving tribute to his grandmother, the Queen.
The letter, which serves as the preface to the upcoming book Elizabeth II: The Steadfast, that is being published ahead of September 9, when the Queen will become the longest reigning monarch.
William praises his grandmother's "kindness and sense of humor" and love for her family and her home.
"From a personal point of view, I am privileged to witness the private side of the Queen, as a grandmother and a great-grandmother," he writes.
"The Queen's kindness and sense of humor, her innate sense of calm and perspective, and her love of family and home are all attributes I experience first-hand."
Here are some of our favourite pictures of William and his grandmother, captioned with quotes from his touching tribute.
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