"Karl August, sometimes anglicised as Charles Augustus (3 September 1757 – 14 June 1828), was the sovereign Duke of Saxe-Weimar and of Saxe-Eisenach (in personal union) ...
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from 1758, Duke of Saxe-Weimar-Eisenach from its creation (as a political union) in 1809, and grand duke from 1815 until his death. He is noted for the intellectual brilliance of his court." - (en.wikipedia.org 16.11.2019)
