Imperial diptych Imperial diptych In Late Antiquity, an imperial diptych is a theoretical type of ivory diptych, made up of two leaves of five panels each and each with a central panel representing the emperor or empress. They are so-named in contrast to consular diptychs. They were produced as unique examples, whereas each consular diptych was produced in large numbers to offer to the emperor on certain occasions, principally a nobleman's entry to the consulship. No complete example of an imperial diptych survives and so their existence is contested. The ivories specialist R. Delbrück has theorised that the 19 surviving fragments of
Perugia Altarpiece panels portray scenes of the "Life of St. Nicholas" <br> Perugia Altarpiece The Perugia Altarpiece (Italian: "Pala di Perugia") is a painting by the Italian early Renaissance painter Fra Angelico, housed in the Galleria Nazionale dell'Umbria of Perugia, Italy. The painting was executed for the St. Nicholas Chapel in the Basilica of San Domenico, Perugia. In the early 19th century, it was split and partially dispersed, and some of the predella panels were acquired by the Pinacoteca Vaticana. In Perugia were executed copies of these panels, enclosed into a neo-Gothic frame. The polyptych also included some small depictions of saints,