The Duke of Edinburgh and his grandson, Prince Harry, will pay their respects at Westminster Abbey's Field of Remembrance today.
The royal pair will be joined by the Dean of Westminster, the Very Reverend John Hall, along with the president of the Royal British Legion Poppy Factory, Sara Jones, and members of the Royal British Legion.
Both Philip and Harry are expected to lay a cross of remembrance in front of two wooden crosses from the graves of unknown British soldiers from the First and Second World Wars.
The Last Post will sound followed by a two-minute silence.
The Prince and his grandfather will then visit plots and meet veterans from past and more recent conflicts.
This is the third occasion that Harry has visited the Field of Remembrance, having previously accompanied the Duke in 2013 and the Queen last year.
The first Field of Remembrance was held in the grounds of Westminster Abbey in November 1928. That year only two remembrance tribute crosses were planted. But it began a tradition that took root and has grown over the decades.
Each remembrance tribute carries a personal message to someone who lost his or her life.