John Frederick, Duke of Pomerania (b. 1542)
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 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.