(L-R) Britain's Prince Philip, Duke of Edinburgh, Colombia's first lady Maria Clemencia de Santos, Britain's Queen Elizabeth II and Colombia's President Juan Manuel Santos pose on arrival at Buckingham Palace on November 1, 2016 in London.
Colombian President Juan Manuel Santos, who won this year's Nobel Peace Prize for his efforts to implement a peace deal with FARC rebels, begins a state visit to Britain that includes a trip to once conflict-ridden Northern Ireland. / AFP / POOL / Leon Neal        (Photo credit should read LEON NEAL/AFP/Getty Images)