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Piotr of Byczyna wrote in his work Cronica principum poloniae (dated at end of the 14th century) about the impossibility of information about Piasts of Opole. The medieval Silesian historiography did not devote them much attention. However, it does not have to mean that they were of low historic importance. It is suggested by the analysis of creations such as the duke’s mausoleum in St. Anna’s chapel...
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