The Prince of Wales and Duchess of Cornwall attended the unveiling of Victoria Cross paving stones in memory of four Irish-born soldiers at Glasnevin Cemetery in Dublin on the final day of their Irish Visit.
The stones in memory of Corporal John Cunningham, Company Sergeant Major Robert Hill Hanna, Lieutenant Frederick Maurice Watson Harvey and Private Michael James O'Rourke, were unveiled at the war memorial the Cross of Sacrifice.
The soldiers were awarded the Victoria Cross in 1917.
Charles paused at the paving stone of Cpl Cunningham after he unveiled the memorial stone.
The Duchess bowed her head as she unveiled the paving stone in memory of Sgt Maj Hill Hanna.
Charles and Irish arts minister Heather Humphreys then laid wreaths at the Cross of Sacrifice.
Their Royal Highnesses also took part in a ceremony at the 1916 Easter Rising memorial, with the Prince laying a wreath at the Necrology Wall which bears the names of all those who died in the rebellion, Irish, British, military, police and civilian.
During a tour of the cemetery, the royal couple visited the graves of Michael Collins and Eamon de Valera, major figures in Irish nationalism.
Later Charles met Irish Taoiseach Enda Kenny in a private meeting in Government Buildings.
As the Prince signed his name in the visitors' book, he joked: "This is just to prove I can write."
Mr Kenny showed Charles the signatures of his mother and father, Queen Elizabeth and Prince Philip.
They signed the book during their historic visit to Ireland in 2011.