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An arched srtucture or a semi-circular end of a wall. In byzantine architecture it means the semicircular, usually barrel-vaulted, niche at the east end of a basilica. The side aisles of a basilica may also end in an apse, but it is always in the central apse where the altar is placed. It was separated from the main church by a barrier, the templon, or the iconostasis. Its ground plan on the external side could be semicircular, rectangular or polygonal.
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cross- (groin-) vault
A vault formed over square or rectangular spaces by the interpenetration of two barrel-vaults of equal hight and diameter. The lines of the intersection form a diagonal cross.
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cross-in-square church
Type of church in which four barrel-vaulted bays form a greek cross; the central square of their intersection is domed. The cross is inscribed into the square ground plan by means of four corner bays.
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dome
A characteristic element of Byzantine architecture. The dome is a hemispherical vault on a circular wall (drum) usually pierced by windows. The domed church emerges in the Early Byzantine years and its various types gradually prevail, while they are expanded in the Balkans and in Russia.
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donor
Whoever subscribes, financialy, to the errection of a certain structure (monument etc). In the case of the buildings, donors might lawfully relate to them via a special connection (usufruct or other).
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drum of dome
Part of the church, semicircular or polygonal, on which rises an hemispheric dome
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gallery
The upper level of a house where the women resided. In ecclesiastical architecture it is the corridor above the aisles and narthex of a church, from where women attended the Liturgy. Originally (in the Byzantine period) the gallery, having a special entrance, was used exclusively by the emperor and the members of the royal family.
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megas doukas
The commander of the Byzantine fleet (from 1092 onwards). In the Late Byzantine period, the title of the megas doukas was assigned to the highest officials of the imperial administration/army.
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pastophoria (parabemata)
Rooms or places that as a rule surrounded the apse, next to to the Holy Bema, of the Paleochristian or Byzantine churches, namely the diakonikon and the prothesis.
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protosebastos
Ηigh-ranking title usually bestowed upon close relatives of the emperor. The title was introduced by Alexios I Komnenos. In the 12th century it was awarded to close associates of the emperor and to members of aristocratic families, such as the Palaiologos, Tarchaneiotes, Raoul and Metochites families.
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sebastokrator
Honorary title of the Byzantine court. The office was established in 1081 by Alexios I Komnenos for his elder brother Isaac, equivalent to the one of regent
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terrace, the
Level surface made through landfills on reclining ground (e.g. on the slopes of mountains or hills), supported with the aid of retaining constructions (e.g. walls and buttresses), aiming at the creation of space suitable for the erection of buildings.
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three-aisled basilica
An oblong type of church internally divided into three aisles: the middle and the two side aisles. The middle aisle is often lighted by an elevated clerestory. In the Early Byzantine years this type of church had huge dimensions.
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transitional domed basilica
A domed basilica, like the Justinianic churches; however, in these transitional basilicas, several openings are piercing the piers that carry the dome. Thus the massive piers begin to gradually dissolve into pillars and finally columns, while they leave space to the corner bays; from these alterations eventually emerges the cross-in-square type.
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