"John (c. 1242 – 13 December 1277), a member of the House of Welf, was Duke of Brunswick-Lüneburg from 1252 until his death. He initially reigned jointly ...
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with his brother, Albert the Tall, until the partition of the duchy in 1269, when John became the first ruler of the newly created Principality of Lüneburg." - (en.wikipedia.org 29.10.2020)
