Tribute To Prince Ernest Charles D'Arenberg At Hotel Des Invalides In Paris

PARIS, FRANCE - MARCH 20: Prince Pierre d'Arenberg, Sylvie d'Arenberg Berggruen, Prince Guillaume of Luxembourg and his wife Sibilla Sandra Weiller, Pierre-Louis de La Rochefoucauld, Duc D' Estissac and Duchesse Sabine attend the mass given in memory of the 100 year anniversary of Prince Ernest Charles D'Arenberg's death in the First World War at Les Invalides on March 20, 2015 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)