William, the 35-year-old Duke of Cambridge, ended his two-year career as an air ambulance pilot last week to turn his full attention to royal duties, alongside his wife Kate.
After decades spent circling the globe, Prince Philip's final official event will take place closer to home, with an audience of Royal Marines gathering at Buckingham Palace.
The Duke of Edinburgh will attend a parade of the Royal Marines at Buckingham Palace on Wednesday, bringing to an end his 64 years as Captain General of the commando force.
The Duke announced his retirement from public duties in May, more than five years after the Palace originally said he would gradually "wind down" his workload, though he remained keen to carry out many of his duties.
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While someone would soon pay for the gaffe, the day goes down in history with Prince Philip relinquishing his duties after an unprecedented 22,219 solo engagements since 1952, serving as the patron, president and member of nearly 783 organisations.
Prince Philip has also made 637 solo visits overseas, written 14 books and given 5,496 speeches since 1952, the royal family said on Twitter.
He told Sky News: "At 96 I really do feel he deserves a rest".
Buckingham Palace has confirmed there are no plans for the Queen to reduce her official workload.
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The 20-year-old junior had amassed almost 92,000 subscribers and about five million total views on his channel. Many of De La Haye's videos referenced his football career at the school.
Younger members of Team Windsor, as the family have been described, will be expected to increase their royal workload to support the Queen.
Despite his age, Philip's decision - which was fully supported by the Queen and was not medically related - came as a surprise as he still appeared to relish meeting people and carrying out his public role.
THE DAILY TELEGRAPH accidentally published an article on its website stating that the Duke of Edinburgh had died - but Prince Philip is still alive and in the middle of his final day of public engagements. We're thinking he'll probably make an appearance at festivities like the queen's birthday.
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Security officials often describe him as a "brainy militant" who was a master in breaking the security cordon. Dujana, who was killed in south Kashmir, was buried somewhere in north Kashmir.