Answer:
Britain - Prime Minister Herbert Henry Asquith, Prime Minister George Lloyd, and King George V.
France - Prime Minister René Viviani (1914 to 1915), Prime Minister Georges Clemenceau (1917 to 1920) and President Raymond Poincaré
Russia - Tsar Nicholas II
Germany - Kaiser Wilhelm II
Italy - King Victor Emmanuel II
Ottoman Empire - Sultan Mehmet V
Austria-Hungary - Emperor Franz Josef I