Octateuch (Gr., "eight-book"): the first eight books of the Bible, the Old Testament.

ogee: pointed.

Ogival arch: a pointed, or Gothic arch.

oikos, oikoi (Gr., home) the term is used for the stanza of hymn, such as the case in the Akathistos Hymn.

Oikumene (Gr. Literally "inhabited earth"): the civilized world, equivalent to the borders of the Roman Empire, the adoption of the title Ecumenical Patriarch, by the Constantinopolitan see, expressed a controversial claim on universal authority, that was challenged by the Papacy.

omophorion (Gr., "cape," "scarf"): long ceremonial scarf worn by bishops, decorated by crosses. The omophorion was worn over the phelonion, and later over the sakkos. The crosses of patriarchal omophorions were blue (see cat 135).

opus sectile (Lat., "cut work"): a type of inlay in marble and other materials used to decorate floors and walls.

orans, orant (Lat., "praying"): figure with both hands raised in the traditional Christian gesture of prayer.

orarion: the long stole exclusively worn by the deacon in the Orthodox Church; it drapes across the left shoulder and extends toward the ground over chest and back. The deacon holds the orarion while making gestures that call the attention of the congregation to the liturgical action. Byzantine writers analogize the movement of the orarion with the beating of angels’ wings, hence their decoration with the words of the seraphic hymn "holy, holy, holy."

orthros (Gr., dawn): liturgical celebration of the first hour of the day, corresponding to Matins in the Western rite.

Ottomans: originally a dynasty of Turkish emirates founded in the thirteenth century by Osman I, later the empire that replaced the Byzantine State. The Ottomans were an ascendant force in Asia Minor and reigned over a large empire, which was only overthrown in 1922. The earliest Greek reference to them is written by Pachymeres in 1302, who reports that the Byzantine army was defeated by a Turkish Chieftain named "Atman." During the fourteenth century the Ottomans conquered a number of Byzantine cities, establishing the first capital at Brousa in 1326. A domino effect ensued and the Ottomans soon had a foothold in the Balkans, shortly after 1371 the Byzantine Emperor was a vassal to the Ottoman Sultan. Only the unforeseen attack of Timur, who defeated Bayezid I, at the Battle of Ankara July 28, 1402 gave the Byzantines a short respite from Ottoman aggression, as Timur set about dismantling of Ottoman power in Anatolia. Furthermore, internal struggles between Bayezid’s heirs between 1402–1413, allowed the Byzantines to make a limited recovery in Thrace and Macedonia. With the death of the relatively conciliatory Murad II, and the ascent of Mehmed II, the final chapter of the Byzantine State began, ending with the fall of the city on May 29, 1453.




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View an online gallery tour in a feature related to the "Byzantium: Faith and Power (1261–1557)" exhibition.

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