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
Jabach Altarpiece Jabach Altarpiece The Jabach Altarpiece is an oil on lime tree panel painting by German Renaissance artist Albrecht Dürer, executed around 1503–1504. Originally a triptych, only the side panels are now preserved: the right picture, measuring 96×54 cm, is housed in the Wallraf-Richartz Museum of Cologne; the left picture, measuring 96×51 cm, is housed in the Städel of Frankfurt. The altarpiece was probably commissioned by Frederick III, Elector of Saxony, for a chapel in his castle at Wittenberg, perhaps in occasion of the end of the plague in 1503. The reconstruction of the work is disputed. Some art historians identify