Imperial diptych offerings to the emperor. However, the fact that the Barberini ivory was almost certainly not a diptych, but some kind of imperial icon without a second panel is a serious argument against the existence of the imperial diptych type. The two panels representing the empress Ariadne, in the Bargello in Florence and the Kunsthistorisches Museum in Vienna, also belong to the hypothesied imperial diptych type. They are the only central panels of such a diptych (other than the Barberini ivory) to survive, since all other fragments of such diptychs are from side panels. Imperial diptych In Late Antiquity, an imperial
Imperial Sovereign Imperial Sovereign The question of an Imperial Sovereign or emperor was a central issue in Germany's attempts at unification between 1848 and 1850. Both the draft constitutional act with its provision for centralised power as well as the constitutional plans at that time, laid down how a German head of state would be selected for office and what rights they were to have. In the Frankfurt Constitution of 28 March 1849, it was envisaged that an emperor would be the 'imperial sovereign'. Although the National Assembly voted for the first incumbent of this office, thereafter it was assumed that the