Britain's Queen Elizabeth II and Prince Philip, Duke of Edinburgh await the arrival of Colombia's president Juan Manuel Santos for ceremonial welcome at the start of the Colombian president's three-day state visit to the UK at Horse Guards Parade in central London on November 1, 2016. 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 / Gareth Fuller (Photo credit should read GARETH FULLER/AFP/Getty Images)
