Count of Holstein-Kiel
John III of Holstein-Plön, called John the Mild, was a Count of Schauenburg and Holstein-Plön and Holstein-Kiel, ruling Holstein-Plön and Holstein-Kiel (1316–1359). Together with Count Gerhard III of Holstein-Rendsburg, John III was the lord ruling in guardianship the Danish Duchy of Schleswig 1332–1340. He was known as “John the Mild”.
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