"Johann Ernest IV, Duke of Saxe-Coburg-Saalfeld (22 August 1658 in Gotha – 17 February 1729 in Saalfeld) was a reigning duke of Saxe-Coburg-Saalfeld." - (en.wikipedia.org 14.06.2020)
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(The left column lists the relations of this actor to objects in the right column. In the middle you find other actors in relation to the same objects.)