peacock throne

 A famous throne formerly of the kings of Delhi, India, but since 1739, when it was carried off by Nadir Shah, held by the shahs of Persia (now Iran); -- so called from its bearing a fully expanded peacock's tail done in gems.  [Webster 1913 Suppl.]

 The office or position of the Shah of Iran; as, to ascend the Peacock Throne.  [PJC]