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plural sakkoses or sakkoi
(Eastern Orthodoxy) A richly decorated vestment worn by Orthodox bishops, instead of a priest's phelonion (chasuble in western church). quotations examples
When in 1411 Emperor John VIII Palaeologos married a daughter of Vasilii II, Grand Prince of Muscovy, he sent Moscow a splendid specimen of the liturgical vestment known as a sakkos as a gift for Metropolitan Photios.
2009, Diarmaid MacCulloch, A History of Christianity, Penguin, published 2010, page 515