William Ernest, Grand Duke of Saxe-Weimar-Eisenach
| William Ernest | |||||
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| Grand Duke of Saxe-Weimar-Eisenach | |||||
| Reign | 5 January 1901 – 9 November 1918 | ||||
| Predecessor | Charles Alexander | ||||
| Successor | Grand duchy abolished | ||||
| Born | 10 June 1876 Weimar, Saxe-Weimar-Eisenach, German Empire | ||||
| Died | 24 April 1923 (aged 46) Henryków, Prussia, Weimar Republic | ||||
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| House | House of Saxe-Weimar-Eisenach | ||||
| Father | Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach | ||||
| Mother | Princess Pauline of Saxe-Weimar-Eisenach | ||||
| Religion | Lutheranism | ||||
William Ernest (Wilhelm Ernst Karl Alexander Friedrich Heinrich Bernhard Albert Georg Hermann, English: William Ernest Charles Alexander Frederick Henry Bernard Albert George Herman; 10 June 1876 – 24 April 1923) was the last grand duke of Saxe-Weimar-Eisenach.