In the Eastern Orthodox and Eastern Catholic liturgical tradition, the omophor (Slavonic: омофоръ, omofor; Greek:ὠμοφόριον omoforion) is the distinguishing vestment of a bishop and the symbol of his spiritual and ecclesiastical authority. Originally of wool, it is a band of brocade decorated with four crosses and an eight-pointed star and is worn about the neck and shoulders.
Clergy and ecclesiastical institutions subject to a bishop's authority are often said to be "under his omophor".
The equivalent vestment in Western Christian usage is the archiepiscopal pallium, the use of which is subject to different rubrics and restrictions, while all Orthodox bishops wear the omophor.
The omophor has two forms: the ancient great omophor, which passes around the neck, is folded in the front, and hangs down past the knees in both the front and the back, like a loosely-worn long scarf; and the small omophor which is much simpler, passing around the neck and hanging down in the front similar to an epitrachil (stole), only wider and shorter, coming down only a little past the waist. Because of the complexity of the great omophor, and because of the dignity of the episcopal office, whenever the bishop puts on the omophor or takes it off, he is assisted by two subdeacons.
Whenever he presides at any divine service, the bishop will be vested in the omophor. If he is serving the Divine Liturgy he will wear both the great and the small omophor at different times over his liturgical vestments. At any service other than the Divine Liturgy he will usually wear the small omophor.
At the Divine Liturgy, the rubrics call for the bishop to put on and take off the omophor numerous times. When he is first vested, the subdeacons place the great omophor on him, but afterwards, when the rubric calls for him to wear the omophor, it is replaced, for the sake of convenience, with the small omophor. In some places, when several bishops concelebrate, it is now the custom for the chief celebrant to use the great omophor when called for, and the other bishops to wear the small omophor throughout .
In the Ruthenian Catholic Church and the Ukrainian Greek Catholic Church, often only the great omophor is used. In this simplified usage, the great omophor is not replaced by the small omophor  , and is worn by the bishop throughout the entire liturgy. In such cases, the omophor is often sewn into shape and can be simple draped onto the shoulders rather than wrapped on by assistants. Some Ukrainian Greek Catholic Bishops, however, will insist on the full ceremonial.
In the early church, the omophor was a broad band of white wool ornamented with crosses and draped loosely over the neck, shoulders, and breast. The modern Roman pallium developed from this early omophor; however, in the West it has changed over the centuries into a circular, thin woolen garment for the shoulders, with short, weighted pendants before and behind. The papal pallium adopted by Pope Benedict XVI is closer to the original omophor.
The only change in the omophor in the East has been the augmentation of its width, and the material from which it is made. There is testimony to the existence of the omophor as a liturgical vestment of the bishop in Isidore of Pelusium about the year 400. It was made of wool and was already seen as symbolic of the duties of bishops as shepherds of their flocks. In the miniatures of an Alexandrian Chronicle of the World, written probably during the fifth century we already find pictorial representation of the omophor. In later times we meet the same representation on the renowned ivory tablet of Trier, depicting the solemn translation of relics. Among the pictures dating from the seventh and eighth centuries, in which we find the omophor, are the lately discovered frescoes in S. Maria, Antiqua in the Roman Forum. The representation in these frescoes is essentially the same as its present form.
The omophor probably developed from the civil omophor, a shoulder garment or shawl in general use. Probably either the bishops introduced directly by a positive precept as a liturgical pontifical badge a humeral cloth resembling the ordinary omophor and called by that name, or the civil omophor was at first used by the bishops as a mere ornament without any special significance, but in the course of time gradually developed into a distinctively episcopal ornament, and finally assumed the character of an episcopal badge of office.
Oriental Orthodoxy 
In Oriental Orthodoxy, the omophor takes a number of different forms:
- The Armenian Orthodox emip'oron is similar to the Byzantine great omophor.
- The Syriac Orthodox baţrašil or uroro rabbo ('great stole') is a straight strip of embroidered material, about 20 cm wide, with a head-hole midway along it, that hangs down a bishop's chest and back.
- Coptic Orthodox hierarchs (Patriarch, Metropolitans and Bishops) wear the omophor, usually folded, due to its large width. It is white in colour, with extensive ornamental embroidery. It is wider than its Byzantine counterpart, wrapped over the head over the monastic Kouklion, then crossed from the front over the chest, wrapped again from the back, crossed over the back by the waist level, then over the shoulders, then coming straight down, tucked under the frontal (over the chest) crossed wrapping. It is called a Ballin, and it is almost the double the length of the Byzantine Omophor.
- This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Pallium". Catholic Encyclopedia. Robert Appleton Company.
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