Ernst I, Duke of Saxe-Altenburg (German: Ernst I. Friedrich Paul Georg Nikolaus von Sachsen-Altenburg) (16 September 1826 in Hildburghausen – 7 February 1908 in Altenburg), was a duke of Saxe-Altenburg. He was the first son of Georg, Duke of Saxe-Altenburg and Marie Luise of Mecklenburg-Schwerin. In 1853, he succeeded his father as Duke of Saxe-Altenburg. He was of a retiring disposition and he took little active part in running the country. After a reign that lasted 55 years, he died without a living direct male heir; because of this, he was succeeded by his nephew, Ernst.
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Marriage
He was married in Dessau on 28 April 1853 to Agnes of Anhalt-Dessau (1824–1897). Agnes was a sister of Friedrich I, Duke of Anhalt.
They had two children:
Marie (b. Eisenberg, 2 August 1854 – d. Camenz, 8 October 1898), married on 19 April 1873 to Albrecht of Prussia.
Georg (b. Altenburg, 1 February 1856 – d. Altenburg, 29 February 1856) died in infancy.
Honours and decorations
German honours
Foreign honours
Austrian Empire: Grand Cross of St. Stephen, 1859