which said: "It is with deep sorrow that Her Majesty The Queen has announced 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.
"The Royal Family join with people around the world in mourning his loss. Further announcements will be made in due course."
The Royal Foundation is a charity that supports the ongoing work of Kate and Prince William.
Recent projects have included supporting key workers in the frontline of the pandemic, conservation and mental health.
It comes as:
Yesterday Prince William pulled out of his Bafta speech in a sign of respect after the death of Prince Philip.
The Duke of Cambridge was due to appear virtually at a ceremony this weekend to deliver a speech about the resilience of the film industry during the coronavirus pandemic.
But after Prince Philip's death on Friday, his grandson William decided he will no longer participate in the virtual event.
Following the news that the Duke of Cambridge has withdrawn from this weekend's Bafta awards ceremony, the organisation said in a statement: "In light of the Duke of Edinburgh's passing, the Duke of Cambridge will no longer be part of Bafta programming this weekend.
"Our thoughts are with the royal family, to whom we offer our deepest sympathy at this time."
It comes as William and his brother Prince Harry will walk behind the Duke of Edinburgh's coffin at his funeral next Saturday.
Harry’s pregnant wife Meghan will not go for medical reasons.
Harry will fly 5,000 miles from the US to be at Windsor Castle next Saturday — where he will meet senior royals for the first time since “Megxit” and his Oprah Winfrey chat.
He will walk behind Philip’s coffin alongside brother William and dad Charles — just weeks after he claimed they were trapped inside the Royal Family.
But a Palace source insisted: “I’m sure Charles will be very happy to see his son. It’s been more than a year. The Prince is very much looking forward to seeing him.”
Harry last saw the royals at the Westminster Abbey Commonwealth Day service on March 9, 2020.
Meanwhile, it was announced yesterday that the Queen and the Royal Family would observe two weeks of mourning for Prince Philip.
The Queen has signed off on the final arrangements to lay to rest her husband of more than 70 years.
The monarch approved the Prime Minister's recommendation to announce a state of national mourning which is to be "observed by all" until Philip's funeral on April 17.
Prince Philip’s funeral to be on TV next Saturday with Charles leading procession to St George’s Chapel in Windsor