Wilhelm August, Duke of Saxe-Eisenach (30 November 1668 – 23 February 1671) was the youngest and only surviving son of

Adolf Wilhelm, Duke of Saxe-Eisenach Adolf Wilhelm, Duke of Saxe-Eisenach (Weimar, 15 May 1632 – Eisenach, 21 November 1668) was a duke of Saxe-Eisenach. He was the fourth but second surviving son of Wilhelm, Duke of Saxe-Weimar and Eleonore Dorothea of Anhalt-Dessau. When ...

and

Marie Elisabeth of Brunswick-Wolfenbüttel Marie Elisabeth of Brunswick-Wolfenbüttel (7 January 1638 - 15 February 1687), was a German noblewoman of the House of Welf and by her two marriages Duchess of Saxe-Eisenach and Saxe-Coburg. Born in Brunswick, she was the second of the three ch ...

. All his older brothers died before his father, and Wilhelm August, the fifth and youngest child, was born nine days after the death of Adolf Wilhelm (21 November 1668) and succeeded him in the duchy of Saxe-Eisenach from the moment of his birth,Beck, August (1875). �
Adolf Wilhelm
�� in: ''Allgemeine Deutsche Biographie'', Volume 1. Historical Commission at the Bavarian Academy of Sciences. pp. 120–121 – via

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. under the guardianship of his uncle Johann Georg. A sickly boy, he died at Eisenach when only two years old, and Eisenach was inherited by his uncle Johann Georg.

References

House of Wettin 1668 births 1671 deaths People from Eisenach Dukes of Saxe-Eisenach Monarchs who died as children Dukes of the Holy Roman Empire {{Germany-noble-stub