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John Sobieslaw of Moravia (1352 - c. 30 October 1380) was a Czech feudal lord, junior margrave of Moravia. John was the third son of John Henry, Margrave of Moravia and Margaret of Opava. In historiography, he was mistaken for his illegitimate half-brother patriarch of Aquileia John of Moravia, for a long time.
References
John Sobieslaw of Moravia Wikipedia(Text) CC BY-SA