The Prince of Wales and Duchess of Cornwall will meet survivors of the Utoya massacre when they begin their tour of Scandinavia.
Charles and Camilla are starting their eight-day visit to the region with engagements in the Norwegian capital of Oslo, where they will be greeted by Crown Prince Haakon and Crown Princess Mette-Marit.
Their tour begins with a wreath-laying ceremony at the city's National Memorial, accompanied by King Harald and Queen Sonja of Norway.
The royals will then travel to Oslo's Nobel Peace Centre where they will speak to young people who survived the attacks by Anders Behring Breivik, who killed scores of victims last summer.
Disguised as a police officer, he planted a car bomb that went off close to government offices in Oslo, killing eight people.
He then drove to the island of Utoya, the venue for a youth camp of Norway's governing Labour Party, where he shot dozens of people.
The 33-year-old right-wing extremist has confessed to the July 22 attacks that left 77 people dead, but denies criminal responsibility.
Among those being introduced to Charles and Camilla is the leader of the Labour youth movement, Eskil Pedersen. He managed to get away from Utoya on one of the first boats leaving the island.
The royal couple, who will also hear discussions on youth engagement and enjoy a musical performance at the Nobel Peace Centre, are to attend a state dinner at Oslo's Royal Palace in the evening.
Their tour will also see them travelling to Bergen, Norway's second largest city, before they leave the country and fly to Sweden.
After the Swedish part of the trip, they will head to Denmark, where they will take part in engagements in Copenhagen and Jutland.
A Clarence House spokesman said: "These visits, to other monarchies linked by common royal descent, mark the start of their Royal Highnesses' official overseas celebrations of The Queen's Diamond Jubilee.
"Their royal highnesses will, in each case, be guests of the sovereign head of state.
"The themes of the tour will include strong historic and diplomatic links between the United Kingdom and all three countries.
"The Prince and Duchess are deeply touched by the invitations from the Sovereigns of Norway, Sweden and Denmark to visit their countries and to celebrate with them Queen Elizabeth II's Diamond Jubilee.
"Throughout their tour, their Royal Highnesses will be supporting a wide range of shared national interests from military co-operation, commercial opportunity and tackling social exclusion.
"In Norway, their Royal Highnesses are greatly looking forward to renewing close family ties between our two Royal Families as well as engaging with youth leaders, and recognising military service and research excellence.
"In Sweden, the royal couple are very much looking forward to spending time with their Majesties as well as having the opportunity to visit one of Europe's largest youth centre and to promote Anglo-Swedish trade links.
"In addition, the Duchess is particularly keen to discover more about the Swedish education model.
"In Denmark, the Prince and Duchess are delighted to be guests of Her Majesty and the Prince Consort and to have the opportunity to recognise our countries' shared work and sacrifice in Afghanistan as well as celebrating our strong commercial and cultural links."
It is the first time Camilla has visited all three countries. Charles last visited Norway in 2010 and Denmark in 2009. It will be his first official visit to Sweden, but he has travelled to the country privately in the past.