The plenipotentiaries of the high powers who signed the treaty,  The General Treaty of the Final Act of the Congress of Vienna… (1815)

“ ART. XVI. [26] The provinces and districts of the kingdom of Saxony, which are transferred to the dominion of his Majesty the King of Prussia, shall be distinguished by the name of the duchy of Saxony, and his Majesty shall add to his titles those of duke of Saxony, Landgrave of Thuringia, Margrave of the two Lusatias, and count of Henneberg. ”
Source: Wikisource

Thomas Keightley,  Secret Societies of the Middle Ages

“ The incursions of the Northmen had become most formidable, and the Vends [112] also gave great disturbance to Germany. The Saxon land being the part most immediately exposed to invasion, the emperor resolved to revive the ancient dignity of dukes, and to place the district under one head, who might direct the energies of the whole people against the invaders. The duke was a royal lieutenant, like the counts, only differing from them in the extent of the district over which he exercised authority. The first duke of Saxony was Count Ludolf, the founder of Gandersheim ”
Source: Gutenberg

The Great Events by Famous Historians…

“ On grand occasions the Duke of Saxony is to carry the sword; the Count Palatine, the globe; the Margrave of Brandenburg, the sceptre. In celebrating mass before the Emperor, the benedictions are to be pronounced by the senior spiritual elector present.
All persons conspiring against the lives of the electors are declared guilty of leze-majesty, and shall forfeit their lives and possessions. The lives of their sons, though justly forfeited, are spared only by the particular bounty of the Emperor
”
Source: Gutenberg

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