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 College Union (representing all postgraduate students) also became a constituent union. The Silwood Park Union operates largely independently from the overall Union but has no part or full-time sabbatical leadership. Imperial College Union has a large number of student-led clubs, volunteering projects and societies (known as CSPs), with over 400 in total. Funding for CSPs at Imperial College Union is significant, taking up a sizeable portion of the Union's annual subvention provided by Imperial College London, though many clubs supplement this with sponsorship from outside of the Union. CSPs at Imperial College Union are administered by the Clubs, Societies' and Project Board,