Britain's Prince William, the Duke of Cambridge (R), and his wife Kate, the Duchess of Cambridge, speak with children as they visit the World War I Thiepval monument northern France, on July 1, 2016, during the Somme battle's centenary commemorations. One week after Britain's vote to leave the European Union, Prime Minister David Cameron and royal family members will stand side-by-side with France's President to celebrate their historic alliance at the centenary of the deadliest battle of World War I. / AFP / POOL / Francois Mori (Photo credit should read FRANCOIS MORI/AFP/Getty Images)
