see more
(LtoR) Britain's Prince William, Duke of Cambridge, Princess Astrid of Belgium and Irish Prime Minister Enda Kenny look at tombstones as they arrive to attend a wreath-laying ceremony during the Battle of Messines Ridge commemorations at the military cemetery in Wijtschate, Belgium, on June 7, 2017.
The Battle of Messines took place June 7-14, 1917 and was an offensive conducted by the British Second Army, during the First World War.
/ AFP PHOTO / POOL / FRANCOIS LENOIR (Photo credit should read FRANCOIS LENOIR/AFP/Getty Images)