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
Altarpiece Reformation regarded the Word of God – that is, the gospel – as central to Christendom, and Protestant altarpieces often displayed the actual words from the bible, sometimes at the expense of pictures. With time, Protestant though gave birth to the so-called pulpit altar, or "Kanzelaltar" in German, in which the altarpiece and the pulpit are combined, thus making the altarpiece quite literally the abode of the Word of God. Canvas painting started to replace other types of altarpieces during the mid-16th century and onwards. The Middle Ages was the heyday of the production and use of altarpieces. While many