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
Maestà The most famous example of the "Maestà" is the "Maestà with Twenty Angels and Nineteen Saints", an altarpiece comprising many individual paintings commissioned by the city of Siena in 1308 from the artist Duccio di Buoninsegna. The painting was installed in the city's cathedral on June 9, 1311. Although it took a generation for its effect truly to be felt, Duccio's "Maestà" set Italian painting on a course leading away from the hieratic representations of Byzantine art towards more direct presentations of reality. Creating this altarpiece assembled from many wood panels bonded together before painting was an arduous undertaking. The