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Boris Klemens Robert Maria Pius Ludwig Stanislaus Xavier or Boris III of Bulgaria (30 January 1894 – 28 August 1943) was the last Tsar of the Kingdom of Bulgaria from 1918 to 1943. He was the son of Ferdinand I of Bulgaria the Tsar of Bulgaria during The Great War from (1914-1918) and ally of Emperor Wilhelm II of Prussia . Boris joined World War 2 in 1941 on the side of Nazi Germany (led by The Fuhrer) Boris invaded Yugoslavia and Greece in 1941 to help the Italians (led by The Duce) . However during World War 2 Bulgaria refused to deport the Jews from Bulgaria during the So called Final Solution . He died in 1943 aged 49 .