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 Regalia Prague. It is also difficult to define for how long the Imperial and Ceremonial Swords have belonged to the regalia. Until the 15th century the Imperial Regalia had no firm depository and sometimes accompanied the ruler on his trips through the empire. Above all with conflicts around the legality of the rule it was important to own the insignia. As depositories during this time some imperial castles or seats of reliable ministerialises are known: Emperor Sigismund transferred the Imperial Regalia "to everlasting preservation" to the Free Imperial City of Nuremberg with a dated document on 29 September 1423. They arrived