"Heinrich of Saxe-Weissenfels, Count of Barby (b. Halle, 29 September 1657 - d. Barby, 16 February 1728), was a German prince of the House of Wettin ...
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and count of Barby.
He was the fourth son of August, Duke of Saxe-Weissenfels, by his first wife, Anna Maria of Mecklenburg-Schwerin." - (en.wikipedia.org 29.01.2020)