"John Frederick (German: Johann Friedrich; 27 August 1542 – 9 February 1600) was Duke of Pomerania from 1560 to 1600, and Bishop of Cammin (Kamień) from ...
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1556 to 1574. Elected bishop in 1556 and heir of the duchy in 1560, he remained under tutelage of his great-uncle Barnim XI until he took on his offices in 1567." - (en.wikipedia.org 27.06.2020)
