Prince Harry is to attend a memorial service at Westminster Abbey for Britons killed in the Tunisian terror attacks.
Harry will lay a wreath at the Innocent Victims Memorial on behalf of his grandmother the Queen as he gathers with families who lost loved ones and those who survived the two atrocities in 2015.
He will also deliver a reading during the central London service, which will be conducted by the Dean of Westminster.
In the worst incident of terrorism involving British people since the July 7 attacks in London in 2005, 38 people including 30 British nationals were killed in a beach massacre in the Tunisian resort town of Sousse in June last year.
Gunman Seifeddine Rezgui targeted holidaymakers on the sands and in a hotel before being shot dead by security forces. Terror group Islamic State (IS) claimed responsibility.
A week after the tragedy, a minute's silence was held across the nation to remember those who died, with the Queen and the Duke of Edinburgh joining in to pay their respects.
Among those killed was engineer Stephen Mellor, from Bodmin, Cornwall, who died as he shielded his wife Cheryl.
Three generations of one family also died when Joel Richards, 19, a University of Worcester student and talented football referee, and his uncle Adrian Evans, 49, and grandfather Charles 'Patrick' Evans, 78, were gunned down. Joel's teenage brother Owen survived the attack.
Three months earlier, IS terrorists opened fire on tourists at the Bardo National Museum in the capital Tunis. British tourist Sally Adey, 57, from Shropshire, was among 22 people killed.
The Government announced last year that it is to fund a permanent memorial dedicated to the victims of the Tunisian beach massacre, as well as creating a separate site of remembrance for all British nationals killed in terrorist atrocities overseas.