"Johann Ernst I, Duke of Saxe-Weimar (21 February 1594 in Altenburg – 6 December 1626 in Sankt Martin, Hungary), was a duke of Saxe-Weimar." - (en.wikipedia.org 31.01.2020)
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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.)