Back ارنست اوجسطس الاول دوق ساكس فايمار ايزيناتش ARZ Ернст Август I (Саксония-Ваймар-Айзенах) Bulgarian Ernest August I de Saxònia-Weimar Catalan Arnošt August I. Sasko-Výmarsko-Eisenašský Czech Ernst August I. (Sachsen-Weimar-Eisenach) German Ερνέστος Αύγουστος Α΄ της Σαξονίας-Βαϊμάρης-Άιζεναχ Greek Ernesto Aŭgusto la 1-a (Saksio-Vajmaro-Eisenach) Esperanto Ernesto Augusto I de Sajonia-Weimar-Eisenach Spanish Ernest-Auguste Ier de Saxe-Weimar-Eisenach French ארנסט אוגוסט הראשון, דוכס סקסוניה-ויימאר-אייזנך HE
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| Ernest Augustus I | |
|---|---|
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| Duke of Saxe-Weimar | |
| Reign | 1707–1748 |
| Predecessor | Wilhelm Ernst with John Ernst III |
| Successor | Ernest Augustus II |
| Co-ruler | Wilhelm Ernst |
| Duke of Saxe-Eisenach | |
| Reign | 1741–1748 |
| Predecessor | Wilhelm Heinrich |
| Successor | Ernest Augustus II |
| Born | 19 April 1688 Weimar |
| Died | 19 January 1748 (aged 59) Eisenach |
| Spouse |
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| Issue | Wilhelm Ernst, Hereditary Prince of Saxe-Weimar Princess Wilhelmine Auguste Johann Wilhelm, Hereditary Prince of Saxe-Weimar Princess Charlotte Agnes Leopoldina Princess Johanna Eleonore Henriette Ernestine Albertine, Countess of Lippe-Alverdissen Bernhardina, Princess of Schwarzburg-Rudolstadt Prince Emmanuel Frederick Karl August Eugen, Hereditary Prince of Saxe-Weimar Ernest Augustus II, Duke of Saxe-Weimar-Eisenach Princess Eleonore Christiane Princess Johanna Auguste Ernestine, Duchess of Saxe-Hildburghausen Prince Ernst Adolf |
| House | House of Saxe-Weimar-Eisenach |
| Father | Johann Ernst III, Duke of Saxe-Weimar |
| Mother | Sophie Auguste of Anhalt-Zerbst |
| Religion | Lutheranism |
Ernest Augustus I, Duke of Saxe-Weimar (German: Ernst August I; 19 April 1688 – 19 January 1748), was a duke of Saxe-Weimar and, from 1741, of Saxe-Weimar-Eisenach.