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 where they were exhibited in the Katharinenkirche. In the Second World War they were stored for protection from air raids in the "Historischer Kunstbunker" () beneath Nuremberg Castle. In 1945 the imperial regalia were found there by US soldiers and were brought back in 1946 to the Hofburg in Vienna. Imperial Regalia The Imperial Regalia, also Imperial Insignia (in German "Reichskleinodien", "Reichsinsignien" or "Reichsschatz"), are regalia of the Holy Roman Emperor. The most important parts are the Imperial Crown, the Holy Lance and the Imperial Sword. Today they are kept at the Imperial Treasury in the Hofburg palace in Vienna,