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 pigeon distributed throughout the Pacific. The Pacific ("D. pacifica") and the Micronesian ("D. oceania") imperial pigeons are similar allospecies, while the Polynesian ("D. aurorae") and Marquesan ("D. galeata") imperial pigeons are larger birds with dark plumage. The red-knobbed imperial pigeon ("D. rubricera") and the spice imperial pigeon ("D. myristicivora") are similar but found in Melanesia and New Guinea. c) The "finschii" subgroup of four species which may be New Guinea representatives of "D. aenea" stock; the purple-tailed ("D. rufigaster"), cinnamon-bellied ("D. basilica") and Finsch's imperial pigeons, which all inhabit offshore islands. The shining or rufescent imperial pigeon ("D. chalconota") occupies more