German duke
John III of Saxe-Lauenburg was the eldest son of Duke Albert IV of Saxe-Lauenburg and Beata of Schwerin, daughter of Gunzelin VI, Count of Schwerin. John III succeeded his father in 1343 as Duke of Saxe-Bergedorf-Mölln, a branch duchy of Saxe-Lauenburg. He died without an heir and was succeeded by his younger brother Albert V.
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