Elevation of the princely county of Arenberg to the status of duchy with full rights of peerage and seat in the Diet of the Empire, with concession of this title to Philippe-François count and prince d’Arenberg, duke of Arschot, etc., and to his brother Charles-Eugène, and to their nephews Philippe and Albert. The title is transmissible to all descendents of the name.
Arms: neither description nor drawing.
Sources: HHStA RR/Fe III.1, 373v.
Pictures: Imperial charter transforming the principality of Arenberg into a duchy