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|Duke of Saxe-Eisenach|
|Successor||Johann Georg I|
|Born||30 November 1668|
|Died||23 February 1671 (aged 2)|
|House||House of Wettin|
|Father||Adolf Wilhelm, Duke of Saxe-Eisenach|
|Mother||Marie Elisabeth of Brunswick-Wolfenbüttel|
Wilhelm August, Duke of Saxe-Eisenach (30 November 1668 – 23 February 1671) was a duke of Saxe-Eisenach.
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, 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 Johann Georg.
| Duke of Saxe-Eisenach
Johann Georg I