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The majestic seal of Casimir Jagellon, found by the author in the Gniezno Archdiocesan Archives is the only, known today, specimen of that seal attached to a document. The king, because of some unspecified reason, which still remains to be studied, did not want to make use of it. In the face of a difficult financial situation and political trouble, he used it only once, on 20 November 1470, setting...
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