FRANCE-BRITAIN-EUROPE-HISTORY-WWI-SOMME-COMMEMORATION

France's President Francois Hollande (R) and Britain's Prince William (2R), flanked by Britain's Catherine Duchess of Cambridge (2R) and Prince Harry (2), pose after unveiling a commemorative plaque inside 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. (Photo by Francois Mori / POOL / AFP) (Photo by FRANCOIS MORI/POOL/AFP via Getty Images)