"John Frederick, Prince of Schwarzburg-Rudolstadt (8 January 1721 in Rudolstadt – 10 July 1767 in ibid) was the ruling Prince of Schwarzburg-Rudolstadt from 1744 to 1767." - (en.wikipedia.org 12.01.2020)
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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.)