Philip, famously described by the Queen as her “constant strength and guide”, died on April 9 at Windsor Castle, two months before his 100th birthday.
The palace said in a statement: “It is with deep sorrow that Her Majesty the Queen announces the death of her beloved husband, His Royal Highness the Prince Philip, Duke of Edinburgh.
“His Royal Highness passed away peacefully this morning at Windsor Castle.
“Further announcements will be made in due course.
“The Royal Family join with people around the world in mourning his loss.”
An online book of condolence has been opened on the royal family’s official website so the public can post their personal tributes.
. Undated picture showing the Royal British couple, Queen Elizabeth II, and her husband Philip, Duke of Edinburgh, with their two children, Charles, Prince of Wales (L) and Princess Anne (R), circa 1951. (Photo credit should read OFF/AFP via Getty Images)
Queen Elizabeth and the Duke of Edinburgh with their two children Prince Charles and Princess Anne in 1951. (Photo: OFF/AFP/ Getty Images) Photo: AFP
. 1947
Lieutenant Philip Mountbatten, prior to his marriage to Princess Elizabeth, saluting as he resumes his attendance at the Royal Naval Officers School at Kingsmoor, Hawthorn, in 1947. (Photo: Keystone/Getty Images) Photo: Keystone
. 1947
Lieutenant Philip Mountbatten, prior to his marriage to Princess Elizabeth, pictured working at his desk after returning to his Royal Navy duties at the Petty Officers Training Centre in Corsham, in 1947. (Photo: Douglas Miller/Keystone/Getty Images) Photo: Douglas Miller
1. 1947
Lieutenant Philip Mountbatten, prior to his marriage to Princess Elizabeth, saluting as he resumes his attendance at the Royal Naval Officers School at Kingsmoor, Hawthorn, in 1947. (Photo: Keystone/Getty Images) Photo: Keystone
2. 1947
Lieutenant Philip Mountbatten, prior to his marriage to Princess Elizabeth, pictured working at his desk after returning to his Royal Navy duties at the Petty Officers Training Centre in Corsham, in 1947. (Photo: Douglas Miller/Keystone/Getty Images) Photo: Douglas Miller
3. 1947
Members of the British royal family on the balcony at Buckingham Palace after the wedding of then Princess Elizabeth and Philip Mountbatten in 1947. (Photo: Evening Standard/Hulton Archive/Getty Images) Photo: Evening Standard
4. 1950
Princess Elizabeth and Prince Philip with their baby daughter princess Anne following her christening at Buckingham Palace in 1950. (Photo: Fox Photos/Hulton Archive/Getty Images) Photo: Fox Photos