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Franz Joseph was the Emperor and King of the Austro-Hungarian Empire during the first half of WWI. He was the Unclce of Archduke Franz Ferdinandwho was assasinated by a Serbian nationalist which resulted in Austria-Hungary declaring war on serbia.
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Wilhelm II was the German Emperor during WWI and the last German Emperor before the monarchy was abolished at the end of the war.
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Tsar Nicholas was the last Emperor of Russia before he was forced to abdicate the throne after the Febuary Revolutions in Russia in 1917.
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Victor Emmanuel III was the King of Italy during both the First and Second World Wars.
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Peter King was the King of Serbia during the first half of WWI before he became King of the Serbs, Croats and Slovenes in 1918.
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Herbert Henry Asquith was the first Prime Minister that the United Kingdom had during WWI.
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In 1908 Ferdinand I Prince of Bulgaria became the Tsar of Bulgaria and ruled during the First World War.
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Mehmed V Reshad was the Sultan of the Ottoman Empire during WWI and was one of the three Emperors of the Central Powers in Europe.
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Theobald von Bethmann-Hollweg was the Chancellor of Germany almsot until the end of the First World War.
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George V was the King of the United Kingdom and the Commenwealth, he reigned during the First World War.
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Raymond Poincaré was the President of France throughout WWI but was sidlined after Georges Clemenceau became Prime Minister.
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Woodrow Wilson was the President of the USA throughout the duration of WWI.
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István Tisza was Prime Minister of Hungary for the second time during the First World War.
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Charles I was the last Emporer and King of the Austro-Hungarian Empire and was the second of two Kings that rained during WWI in Austria-Hungary.
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David Lloyd George was the second Prime Minister of the United Kingdom during the First World War.
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Alexander Kerensky was the leader of the Russian Provisional Government after the monarchy of Russian fell.
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Vittorio Emanuele Orlando was the Prime Minister of Italy towards the end of WWI.
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Vladimir Lenin was the leader of Russia after the October Revolution of 1917 in which the Provisional Government of Russia was overthrown.
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Georges Clemenceau was Prime Minister of France during WWI and was an extremely influencial person in France during the War.
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Peter I was the King of Serbia and in 1918 became King of the Serbs, Croats and Slovenes.