SLIGO, IRLEAND - MAY 20:  Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall take part in a prayer following planting a London Oak after a service of peace and reconciliation at St. Columba's Church in Drumcliffe on the second day of a four day visit to Ireland on May 20, 2015 in Sligo, Ireland. The Prince of Wales and Duchess of Cornwall arrived in Ireland yesterday for their four day visit to the Republic and Northern Ireland, the visit has been described by the British Embassy as another important step in promoting peace and reconciliation.  (Photo by Brian Lawless - WPA Pool/Getty Images)