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In page Pope Pius II:

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His Epistles, which were collected by himself, are also an important source of historical information. His Epistles contain one of the best known descriptions of the enthronement ceremony of the Carinthian dukes on the Prince's Stone and the Duke's Chair.[6] It is generally considered to be the source for Jean Bodin's description of the ceremony in his Six Livres de la République.[citation needed]