The Duke of Edinburgh has died in Windsor Castle at the age of 99, Buckingham Palace announced on Friday.
Prince Philip was recently in hospital for more than a month after being admitted as a precautionary measure and was discharged after treatment for an infection and successful surgery for a pre-existing heart condition.
He would have turned 100 in June.
"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," the statement, which was shared on Twitter, said.
"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."
'A very sad day for our country'
Fans, friends and family members were quick to pay tribute to the Greek prince who married Elizabeth in 1947 and played a key role in modernising the British monarchy in the post-Second World War period.
Former Good Morning Britain host Piers Morgan took to Twitter to express his sadness.
"A truly great Briton who dedicated his life to selfless public duty & was an absolute rock of devoted support to Her Majesty, The Queen, as the longest-serving royal consort to any British sovereign," he wrote.
"A very sad day for our country. Thank you, Sir."
Bucks Fizz star Cheryl Baker recalled the "many times" she met the duke, adding "99 is a fabulous age to reach".
Irish broadcaster Eamonn Holmes kept it simple, writing: "HRH Prince Philip has died. #RIP"
Carol Vorderman, best known for co-hosting the game show Countdown for 26 years, expressed her condolences to the queen.
"I went for a private lunch with The Queen at Buckingham Palace quite a few years ago. They were both in their eighties and Prince Philip and she were flirting with each other madly and laughing. Theirs was a love and a marriage of more than 73 years. Deepest condolences Ma'am."
British business magnate and The Apprentice star Lord Alan Sugar added: "Very sad to hear that the Duke of Edinburgh Prince Philip has passed away. My thoughts are with HRH & the Royal family. R.I.P."
Former Spice Girl Geri Horner, nee Halliwell, wrote: "Thinking of Her Majesty the Queen and the Royal Family at this time."
The multi-hyphenate Floella Benjamin said she was sad to hear Prince Philip died "just short of his 100th birthday". She added: "He was always kind and supportive to me on many occasions."
Singer and actress Elaine Page said it was "terribly sad news for Great Britain, the Commonwealth and the world", expressing her "deepest condolences" to the queen, "who has lost her husband, confidant and life partner".
TV presenter Charlotte Hawkins said it was "the end of an era with the death of the Duke of Edinburgh".
People paid tribute in person, too, with many laying flowers at the gate of Buckingham Palace in central London after the announcement.
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People place flowers and condolence messages outside Buckingham Palace following the death of Prince Philip. EPA -
epa09124345 People place a Union Jack next to flowers outside Buckingham Palace. EPA -
Jockeys and trainers observe a minute of silence in Aintree. EPA -
Flowers are left at the entrance to Windsor castle. AFP -
A young girl places flowers outside Buckingham Palace. EPA -
Children add to the floral tributes outside the Henry VIII Gate of Windsor Castle. AFP -
People gather outside Buckingham Palace. EPA -
An announcement is attached to the fence of Buckingham Palace. Reuters -
The Union Flag flies at half-mast atop Buckingham Palace. AFP -
People wait in a line to view the announcement at Buckingham Palace. AP Photo -
People take pictures of the announcement displayed on the fence of Buckingham Palace. AP Photo -
A member of the media reports outside Buckingham Palace. Reuters -
A tribute on a big screen for the late Prince Philip, ahead of Ladies Day of the Grand National Festival at Aintree Racecourse, Liverpool. PA -
Video screens show pictures Prince Philip at the Grand National Horse Racing meeting at Aintree racecourse, near Liverpool. AP Photo -
Staff members bring a notice to the fence of Buckingham Palace. Reuters
Since the outbreak of the coronavirus, Philip has made few public appearances.
He was last seen at a staged appearance at a military ceremony at Windsor Castle in July, days after attending the wedding ceremony of his granddaughter Princess Beatrice.
In November, he and the queen marked their wedding anniversary by releasing a photograph of them together at Windsor.
