Prince William has taken over a poignant job from his younger brother Prince Harry.
The elder sibling, and second in line to the throne, will lay a wreath on behalf of the Queen at the Anzac Day ceremony at the Cenotaph, Kensington Palace has announced.
The 95-year-old monarch has been forced to pull out of a number of public appearances for health reasons in recent months.
It comes after she shed a tear at late husband Prince Philip's memorial service at the end of March, having been determined to attend no matter what her condition.
Harry, 37, had previously been the grandson she had turned to to lay the wreath on her behalf in 2016, 2018 and 2019.
However, he stepped down as a working royal the following year and moved to the US.
He has since said he worries for his and his family's safety if he returns to Britain without the royal-level protection members of the Firm receive from the Met.
William, 39, will also remember Australians and New Zealanders who have lost their lives in conflict by attending a service of thanksgiving at Westminster Abbey.
The two events fall on April 25, and will follow a Dawn Service at Wellington Arch at London's Hyde Park Corner which will be attended by the Queen's cousin the Duke of Gloucester.
Some 300 to 400 former and serving military personnel and their families and members of veterans associations will gather at the Cenotaph for the wreath laying.
The traditional church service in the abbey will feature an address by the Dean of Westminster, readings from the New Zealand and Australian high commissioners, prayers read by children of each country, and a Maori waiata performed by London-based Ngati Ranana London Maori Club.
It has become customary for other members of the family to lay the wreath on the Queen's behalf in recent years.
The Duke of Sussex did so in 2016 and 2018, and attended the abbey service with his sister-in-law Kate in 2019 just days before the birth of his son Archie.
William marked Anzac Day in 2021 by sending a message to the New Zealand and Australian High Commissions in London, saying: "Today we stand together to reflect not only on their sacrifices, but also their courage, sense of duty, and their famously indomitable spirit."
The duke was on a two-day trip to New Zealand in 2019 to honour the victims of the Christchurch terrorist attack, and laid a wreath during an Anzac Day memorial service in Auckland.
The Princess Royal attended last year's dawn service and the gathering in the abbey.
It comes after a royal expert said the Duke and Duchess of Cambridge have been left with a "tough" workload due to the Sussexes' departure.
The team of senior royals carrying out duties on behalf of the Queen has further reduced following Prince Andrew's withdrawal from public life.
At the same time, the Queen herself has been winding down her busy schedule after suffering from health problems late last year.
This means several other younger members of the Firm have had to ramp up their public duties - not least Prince William and Kate.
And former BBC royal correspondent Jennie Bond said this has been particularly tough on them due to their young family.
“It’s been quite tough on William and Kate, with their young family, to step up and take on so many more responsibilities.
“They obviously set up Shout with the idea that the four of them would share out the workload and now it’s just the two of them.
“William has an awful lot else to do, so Kate is shouldering more of the workload. It must be difficult with the children, but they are getting used to the reality,” she added.
