Ernest Augustus I, Duke of Saxe-Weimar-Eisenach

Ernest Augustus I
Duke of Saxe-Weimar and Eisenach
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 17411748
Predecessor Wilhelm Heinrich
Successor Ernest Augustus II
Born (1688-04-19)19 April 1688
Died 19 January 1748(1748-01-19) (aged 59)
Spouse Eleonore Wilhelmine of Anhalt-Köthen
Sophie Charlotte of Brandenburg-Bayreuth
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 Schaumburg-Lippe
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.


He was the second but eldest surviving son of Johann Ernst III, Duke of Saxe-Weimar and his first wife Sophie Auguste of Anhalt-Zerbst.

When his father died in 1707, Ernst August became co-ruler (Mitherr) of Saxe-Weimar, along with his uncle Wilhelm Ernst, but his title was only nominal, since Wilhelm Ernst was the actual ruler of the duchy. Only when Wilhelm Ernst died in 1728 did Ernst August begin to exercise true authority over Saxe-Weimar.


Ernst August was a splendor-loving ruler, and his extravagances contributed to the eventual financial ruin of his duchy. Desperately in need of funds, he resorted to the practice of arresting wealthy subjects without cause, and setting them free only after they had renounced their fortunes to the duke, or had paid exorbitant ransoms. Some of the victims, who considered this behaviour illegal, made claims against the duke at the Imperial Court in Vienna or in the Imperial Chamber Court of Appeal in Wetzlar. Ernst August lost all the legal proceedings mounted against him. The process lasted for many years and eventually led to the duchy's bankruptcy.

The duke maintained a standing army that was disproportionately large for the duchy's population or financial resources. Some of the soldiers were rented to the Electorate of Saxony or to the Holy Roman Emperor. Ernst August's mania for building led to the construction of the Kleinode, the small Schloss Belvedere and the Rococo Schloss of Dornburg, a lavish residence for the duke. His passion for the hunt was likewise extravagant; when he died, Ernst August left 1,100 dogs and 373 horses. The duke maintained a standing "harem," in which two noble "Ladies of Honour" (Ehrenfräulein) and three "Chamber Women" (Kammerfrauen) of low birth attended to his desires.

Marriages and children

In Nienburg on 24 January 1716, Ernst August married Eleonore Wilhelmine of Anhalt-Köthen, daughter of Emmanuel Lebrecht, Prince of Anhalt-Köthen. They had eight children:

  1. William Ernest (b. Weimar, 4 July 1717 - d. Halle, 8 June 1719), Hereditary Prince of Saxe-Weimar.
  2. Wilhelmine Auguste (b. Weimar, 4 July 1717 - d. Weimar, 9 December 1752), twin of Wilhelm Ernst.
  3. John William (b. Weimar, 10 January 1719 - d. Weimar, 6 December 1732), Hereditary Prince of Saxe-Weimar.
  4. Charlotte Agnes Leopoldina (b. Weimar, 4 December 1720 - d. Weimar, 15 October 1724).
  5. Johanna Eleonore Henriette (b. Weimar, 2 December 1721 - d. Weimar, 17 June 1722).
  6. Ernestine Albertine (b. Weimar, 28 December 1722 - d. Alverdissen, 25 November 1769), married on 6 May 1756 to Philipp II, Count of Schaumburg-Lippe.
  7. Bernhardina Christina Sophia (b. Weimar, 5 May 1724 - d. Rudolstadt, 5 June 1757), married on 19 November 1744 to John Frederick, Prince of Schwarzburg-Rudolstadt.
  8. Emmanuel Frederick William Bernard (b. Weimar, 19 December 1725 - d. Weimar, 11 June 1729).

After the death of his first wife in 1726, the duke decided to not marry again, choosing to live quietly with his Ladies of Honor and Chamber Women. But in 1732 the situation changed unexpectedly: his only surviving son, the hereditary prince (Erbprinz) Johann Wilhelm, died. This made it necessary for him to find a new wife and sire sons in order to perpetuate the dynasty.

In Bayreuth on 7 April 1734, Ernst August married his second wife, Sophie Charlotte of Brandenburg-Bayreuth, daughter of George Frederick Charles, Margrave of Brandenburg-Bayreuth. They had four children:

  1. Charles Augustus Eugen (b. Weimar, 1 January 1735 - d. Weimar, 13 September 1736), Hereditary Prince of Saxe-Weimar.
  2. Ernst August II Konstantin, Duke of Saxe-Weimar-Eisenach (b. Weimar, 2 June 1737 - d. Weimar, 28 May 1758).
  3. Ernestine Auguste Sophie (b. Weimar, 4 January 1740 - d. Hildburghausen, 10 June 1786), married on 1 July 1758 to Ernst Frederick III Karl, Duke of Saxe-Hildburghausen.
  4. Ernest Adolph Felix (b. and d. Weimar, 23 January 1741 / b. Weimar, 1742 - d. Weimar, 1743) [?].

The duke also had an illegitimate son with Friederike von Marschall:

  1. Ernest Frederick (b. 1731 - d. 1810), created Freiherr von Brenn; married to Beate Helene Bormann, his line died out in the male line in 1849.

Saxe-Weimar-Eisenach and absolutism

In 1741 the branch of Saxe-Eisenach-Jena became extinct with the death of Wilhelm Heinrich, Duke of Saxe-Eisenach. As the only surviving kinsman of the late duke, Ernst August inherited his estates; the union between Saxe-Weimar and Saxe-Eisenach-Jena now became permanent. One of the duke's few wise decisions was the institution of the Primogenitur in Saxe-Weimar (confirmed in 1724 by the Emperor Karl VI); this stopped further land divisions in the future. From 1741 his new duchy took the name of Saxe-Weimar-Eisenach (Jena was merged by Eisenach), but the union was by this time only personal. The new state consisted of two larger areas around the two official residences in Weimar and Eisenach, which were not connected, and a patch of smaller areas and towns between them.

The annexation of Saxe-Eisenach was favorable to the hunt-loving duke; he possessed a large swath of woods in the Eisenach region, which seemed suitable to him for hunting. He left the Hereditary Prince in Weimar in the Schloss Belvedere, under the guardianship of his Hofmarschall, and moved permanently to Eisenach. After this, the duke rarely asked for his son, and send the most unreasonable written instructions from Eisenach to Weimar in order to supervise his son's education. The Hereditary Prince saw his father for the last time in 1743.

Ernst August tried to implement Absolutism in Saxe-Weimar on the French model. The secret Ratskollegium —a consultative organ national formed by nobles— was dissolved. In 1746 the citizens of Eisenach presented the duke a memorandum detailing national prerogatives, in which he was denounced for constant offences against traditional rights. The gesture demonstrated that the citizens of the duchy were resisting the introduction of absolutism, thus certain policies that Ernst August had planned could not be completely carried out. The duke's death prevented a terrible controversy between the national nobles and the citizens of Eisenach.


Upon his death, Ernst August left a financially ruined duchy, and a successor to the throne (Ernst August II) who was still under age.



Ernest Augustus I, Duke of Saxe-Weimar-Eisenach
Born: 19 April 1688 Died: 19 January 1748
Preceded by
Wilhelm Ernst
with John Ernst III
Duke of Saxe-Weimar
1707 1748
With: Wilhelm Ernst 1707–1728
Succeeded by
Ernst August II
Preceded by
Wilhelm Heinrich
Duke of Saxe-Eisenach
1741 1748
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