BELGIUM-WWI-HISTORY-BRITAIN-ROYALS

Queen Mathilde of Belgium (L) listens to Britain's Catherine, Duchess of Cambridge as they attend a ceremony marking the centenary of the battle of Passchendaele, one of the bloodiest of World War I during the Last Post ceremony at the Commonwealth War Graves Commission in Ypres (Menin Gate) Memorial, in Ypres Western Flanders on July 30, 2017. The battle of Passchendaele, also called the third battle of Ypres, took place between July 31 and November 6, 1917 in Passendale, West Flanders. (Photo by JOHN THYS / AFP via Getty Images)